CVE-2026-43939
high
CVSS v3
7.3
CVSS v4 NEW
—
VIR risk
7.3
Description
YAFNET has Stored XSS in Forum Thread Posts/Replies that Allows Arbitrary JavaScript Execution for All Thread Viewers
Predictions
Exploit likelihood
82%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| NuGet | YAFNET.Core | >=4.0.0-beta01,<4.0.5 | 4.0.5 |
| NuGet | YAFNET.Core | <3.2.12 | 3.2.12 |
| NUGET | YAFNET.Core | <= 3.2.11 | 3.2.12 |
| NUGET | YAFNET.Core | >= 4.0.0-beta01, <= 4.0.4 | 4.0.5 |
References
- https://github.com/YAFNET/YAFNET/security/advisories/GHSA-8rq5-wwpp-fmj2
- https://nvd.nist.gov/vuln/detail/CVE-2026-43939
- https://github.com/YAFNET/YAFNET
- https://github.com/YAFNET/YAFNET/releases/tag/v3.2.12
- https://github.com/YAFNET/YAFNET/releases/tag/v4.0.5
- https://github.com/advisories/GHSA-8rq5-wwpp-fmj2
CWEs
CWE-79 CWE-80 CWE-116
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.