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CVE-2026-43939

YetAnotherForum.NET (YAF.NET) is a C# ASP.NET forum. Prior to 4.0.5 and 3.2.12, the thread posting and reply feature accepts user-supplied content via a a post or reply that is stored server-side and later rendered back into the thread page without adequate HTML sanitization or contextual output encoding. This vulnerability is fixed in 4.0.5 and 3.2.12.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5c0e1309dc5c4fe86cf66e36e3557b8a453608383233bb0bbfea9b2f0a2040bf
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-80","description":"CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/problemTypes/2/descriptions/0

Affected products and versions

1 source assertion
{"product":"YAFNET","vendor":"YAFNET","versions":[{"status":"affected","version":">= 4.0.0-beta.1, < 4.0.5"},{"status":"affected","version":"< 3.2.12"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-80","description":"CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-116","description":"CWE-116: Improper Encoding or Escaping of Output","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/problemTypes/2/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/YAFNET/YAFNET/security/advisories/GHSA-8rq5-wwpp-fmj2","tags":["x_refsource_CONFIRM"],"url":"https://github.com/YAFNET/YAFNET/security/advisories/GHSA-8rq5-wwpp-fmj2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/YAFNET/YAFNET/security/advisories/GHSA-8rq5-wwpp-fmj2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:d8e8181fe4963e0526cde920b8e83548011e1f8052c198dea062325baf65d50e · sha256:9d89ccfdb41d0e4a… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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