Vulnerability-Lookup

CVE-2026-73628 (GCVE-0-2026-73628)

Vulnerability from cvelistv5 – Published: 2026-08-13 11:28 – Updated: 2026-08-13 15:08

Title

Serendipity 2.3.5 Reflected XSS via search clean-URL route

Summary

Serendipity versions >= 2.3.5 and <= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/<term>). In include/functions_routing.inc.php serveSearch(), the sanitisation pipeline runs urldecode() after HTML-encoding, so a single URL-encoded HTML payload survives strip_tags() and htmlspecialchars() and is then decoded back into live HTML in the page. A crafted search link can execute arbitrary JavaScript in the victim's browser. Fixed in 2.6.1.

Severity

5.3 (Medium)


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

6.1 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-13 15:08 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

VulnCheck

References

2 references

URL	Tags
https://github.com/s9y/Serendipity/security/advis…	vendor-advisory
https://www.vulncheck.com/advisories/serendipity-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
s9y	Serendipity	Unaffected: 0 , < 2.3.5 (semver) cpe:2.3:a:s9y:serendipity:2.5.0:-:::::: cpe:2.3:a:s9y:serendipity:2.4.0:-:::::: cpe:2.3:a:s9y:serendipity:2.6.0:beta1:::::: cpe:2.3:a:s9y:serendipity:2.6.0:-:::::: cpe:2.3:a:s9y:serendipity:2.4.0:beta1:::::: cpe:2.3:a:s9y:serendipity:2.3.5:::::::*

Date Public

2026-07-26 00:00

Credits

hutsbotnet

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-73628

Vulnerability from fkie_nvd - Published: 2026-08-13 12:17 - Updated: 2026-08-13 16:19

Severity

6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/serendipity-reflected-xss-via-search-clean-url-route
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-73628",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-13T15:08:16.669318Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-13T12:17:28.183",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/serendipity-reflected-xss-via-search-clean-url-route"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-4G8W-WG6X-GVQC

Vulnerability from github – Published: 2026-08-13 12:31 – Updated: 2026-08-13 12:31

Details

Serendipity versions >= 2.3.5 and <= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/). In include/functions_routing.inc.php serveSearch(), the sanitisation pipeline runs urldecode() after HTML-encoding, so a single URL-encoded HTML payload survives strip_tags() and htmlspecialchars() and is then decoded back into live HTML in the page. A crafted search link can execute arbitrary JavaScript in the victim's browser. Fixed in 2.6.1.

Severity

6.1 (Medium)


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

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-73628"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-13T12:17:28Z",
    "severity": "MODERATE"
  },
  "details": "Serendipity versions \u003e= 2.3.5 and \u003c= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/\u003cterm\u003e). In include/functions_routing.inc.php serveSearch(), the sanitisation pipeline runs urldecode() after HTML-encoding, so a single URL-encoded HTML payload survives strip_tags() and htmlspecialchars() and is then decoded back into live HTML in the page. A crafted search link can execute arbitrary JavaScript in the victim\u0027s browser. Fixed in 2.6.1.",
  "id": "GHSA-4g8w-wg6x-gvqc",
  "modified": "2026-08-13T12:31:11Z",
  "published": "2026-08-13T12:31:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/s9y/Serendipity/security/advisories/GHSA-6c2x-mjmq-vx4q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73628"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/serendipity-reflected-xss-via-search-clean-url-route"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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.

Action not permitted

CVE-2026-73628 (GCVE-0-2026-73628)

FKIE_CVE-2026-73628

GHSA-4G8W-WG6X-GVQC

Tags

Sightings

Nomenclature