---
id: "CVE-2026-116208"
kind: "vulnerability"
aliases: ["CVE-2026-116208"]
title: "YesWiki: missing authorization lets rogue ActivityPub servers alter other actors' entries"
severity: "high"
cvss: 8.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["activitypub", "package", "php", "self-hosted", "yeswiki"]
not_affected_if: ["activitypub-sync-unused", "version-4.7.0-or-later"]
published_at: "2026-10-25T14:17:02+00:00"
first_seen_at: "2026-10-25T14:41:23+00:00"
updated_at: "2026-10-25T14:42:27+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116208", "first_seen_at": "2026-10-25T14:41:23+00:00"}]
---

# YesWiki: missing authorization lets rogue ActivityPub servers alter other actors' entries

YesWiki before 4.7.0 trusts cross-actor ActivityPub activities during sync, so a malicious ActivityPub server can serve an outbox that deletes, overwrites or forges mirrored entries. An attacker can delete or overwrite content belonging to other actors.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed YesWiki version; the sources say versions 4.6.2 up to but not including 4.7.0 are affected.
- Look for ActivityPub sync features enabled and an admin running the sync against remote servers.

## Fix

- Upgrade YesWiki to `4.7.0` or later.

## Timeline

- 2026-10-25T14:41:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116208

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_