Vulnerability-Lookup

GHSA-564F-WX8X-878H

Vulnerability from github – Published: 2026-03-20 17:25 – Updated: 2026-03-20 17:25

Summary

Vikunja read-only users can delete project background images via broken object-level authorization

Details

Summary

The DELETE /api/v1/projects/:project/background endpoint checks CanRead permission instead of CanUpdate, allowing any user with read-only access to a project to permanently delete its background image.

Details

The RemoveProjectBackground handler (pkg/modules/background/handler/background.go) reuses checkProjectBackgroundRights, a helper originally written for the read-only GetProjectBackground endpoint. This helper only verifies CanRead permission. In contrast, the handler for setting a background (setBackgroundPreparations) correctly checks CanUpdate.

As a result, destructive write operations (deleting the background file from storage and clearing the project's background_file_id and background_blur_hash fields) are gated behind a read-only permission check.

Impact

A user with read-only access to a project — via direct sharing, team membership, link share tokens with read permission, or read-scoped API tokens — can permanently delete the project's background image. The background file is removed from storage and cannot be recovered. This constitutes unauthorized data destruction.

Reproduction

User A creates a project and sets a background image.
User A shares the project with User B with read-only permission.
User B sends: DELETE /api/v1/projects/{project_id}/background with a valid auth token.
The request succeeds. The background image is permanently deleted.

References

pkg/modules/background/handler/background.go — RemoveProjectBackground (line 416), checkProjectBackgroundRights (line 304), setBackgroundPreparations (line 106)
pkg/routes/routes.go line 665 — route registration

Credits

This vulnerability was found using GitHub Security Lab Taskflows.

Severity

5.3 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "code.vikunja.io/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.20.2"
            },
            {
              "fixed": "2.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33312"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-20T17:25:21Z",
    "nvd_published_at": "2026-03-20T15:16:18Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe `DELETE /api/v1/projects/:project/background` endpoint checks `CanRead` permission instead of `CanUpdate`, allowing any user with read-only access to a project to permanently delete its background image.\n\n## Details\n\nThe `RemoveProjectBackground` handler (`pkg/modules/background/handler/background.go`) reuses `checkProjectBackgroundRights`, a helper originally written for the read-only `GetProjectBackground` endpoint. This helper only verifies `CanRead` permission. In contrast, the handler for *setting* a background (`setBackgroundPreparations`) correctly checks `CanUpdate`.\n\nAs a result, destructive write operations (deleting the background file from storage and clearing the project\u0027s `background_file_id` and `background_blur_hash` fields) are gated behind a read-only permission check.\n\n## Impact\n\nA user with read-only access to a project \u2014 via direct sharing, team membership, link share tokens with read permission, or read-scoped API tokens \u2014 can permanently delete the project\u0027s background image. The background file is removed from storage and cannot be recovered. This constitutes unauthorized data destruction.\n\n## Reproduction\n\n1. User A creates a project and sets a background image.\n2. User A shares the project with User B with **read-only** permission.\n3. User B sends: `DELETE /api/v1/projects/{project_id}/background` with a valid auth token.\n4. The request succeeds. The background image is permanently deleted.\n\n## References\n\n- `pkg/modules/background/handler/background.go` \u2014 `RemoveProjectBackground` (line 416), `checkProjectBackgroundRights` (line 304), `setBackgroundPreparations` (line 106)\n- `pkg/routes/routes.go` line 665 \u2014 route registration\n\n## Credits\n\nThis vulnerability was found using [GitHub Security Lab Taskflows](https://github.com/GitHubSecurityLab/seclab-taskflows).",
  "id": "GHSA-564f-wx8x-878h",
  "modified": "2026-03-20T17:25:21Z",
  "published": "2026-03-20T17:25:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-564f-wx8x-878h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33312"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-vikunja/vikunja"
    },
    {
      "type": "WEB",
      "url": "https://vikunja.io/changelog/vikunja-v2.2.0-was-released"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vikunja read-only users can delete project background images via broken object-level authorization"
}

CVE-2026-33312 (GCVE-0-2026-33312)

Vulnerability from cvelistv5 – Published: 2026-03-20 14:42 – Updated: 2026-03-20 19:24

Title

Read-only Vikunja users can delete project background images via broken object-level authorization

Summary

Vikunja is an open-source self-hosted task management platform. Starting in version 0.20.2 and prior to version 2.2.0, the `DELETE /api/v1/projects/:project/background` endpoint checks `CanRead` permission instead of `CanUpdate`, allowing any user with read-only access to a project to permanently delete its background image. Version 2.2.0 fixes the issue.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-20 19:23 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/go-vikunja/vikunja/security/ad…	x_refsource_CONFIRM
https://vikunja.io/changelog/vikunja-v2.2.0-was-r…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
go-vikunja	vikunja	Affected: >= 0.20.2, < 2.2.0

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-33312",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-20T19:23:32.910678Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-20T19:24:20.400Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
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          "product": "vikunja",
          "vendor": "go-vikunja",
          "versions": [
            {
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              "version": "\u003e= 0.20.2, \u003c 2.2.0"
            }
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        {
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          "value": "Vikunja is an open-source self-hosted task management platform. Starting in version 0.20.2 and prior to version 2.2.0, the `DELETE /api/v1/projects/:project/background` endpoint checks `CanRead` permission instead of `CanUpdate`, allowing any user with read-only access to a project to permanently delete its background image. Version 2.2.0 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-20T14:42:14.137Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-564f-wx8x-878h",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-564f-wx8x-878h"
        },
        {
          "name": "https://vikunja.io/changelog/vikunja-v2.2.0-was-released",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://vikunja.io/changelog/vikunja-v2.2.0-was-released"
        }
      ],
      "source": {
        "advisory": "GHSA-564f-wx8x-878h",
        "discovery": "UNKNOWN"
      },
      "title": "Read-only Vikunja users can delete project background images via broken object-level authorization"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-33312",
    "datePublished": "2026-03-20T14:42:14.137Z",
    "dateReserved": "2026-03-18T21:23:36.676Z",
    "dateUpdated": "2026-03-20T19:24:20.400Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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GHSA-564F-WX8X-878H

Summary

Details

Impact

Reproduction

References

Credits

CVE-2026-33312 (GCVE-0-2026-33312)

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