CVE-2026-52769

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Source
https://cve.org/CVERecord?id=CVE-2026-52769
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52769.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-52769
Aliases
Published
2026-09-04T23:40:58.793Z
Modified
2026-09-06T03:46:01.754170989Z
Severity
  • 8.3 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L CVSS Calculator
Summary
YesWiki: Unauthenticated Server-Side Request Forgery via ActivityPub `Signature.keyId`
Details

YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, the POST /api/forms/{formId}/actor/inbox route - exposed publicly with acl:"public" - accepts an HTTP Signature header whose keyId parameter is a URL. HttpSignatureService::verifySignature() parses the header and immediately makes a server-side HTTP GET to that URL, before any cryptographic verification or URL validation. An unauthenticated remote attacker can therefore make YesWiki issue arbitrary outbound HTTP requests to any host the server can reach - internal services, cloud-metadata endpoints (169.254.169.254), intranet-only admin panels, etc. - and read enough back via timing and error-message oracles to scan ports, enumerate services, and (on a real cloud instance) reach IAM metadata. The only deployment-side precondition is that ActivityPub be enabled on at least one Bazar form. This issue has been patched in version 4.6.6.

Database specific 
{
    "cwe_ids": [
        "CWE-918"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52769.json"
}
References

Affected packages

Git / github.com/yeswiki/yeswiki

Affected ranges

Type
GIT
Repo
https://github.com/yeswiki/yeswiki
Events
Introduced
396b5fb891fdeca1a010c97d3cfe4d7ff897110b
Fixed
fa81922f4103630911cbea98ead3c4b7bc786e19
Database specific
Show details 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "4.6.2"
        },
        {
            "fixed": "4.6.6"
        }
    ]
}

Affected versions

v4.*
v4.6.2
v4.6.3
v4.6.4
v4.6.5

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52769.json"