---
id: "CVE-2026-116825"
kind: "vulnerability"
aliases: ["CVE-2026-116825"]
title: "YesWiki: captured ActivityPub requests can be replayed to repeat actions"
severity: "high"
cvss: 8.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["activitypub", "package", "self-hosted", "yeswiki"]
not_affected_if: ["version-4.7.0-or-later"]
published_at: "2026-10-27T00:17:17+00:00"
first_seen_at: "2026-10-27T00:25:56+00:00"
updated_at: "2026-10-27T00:26:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116825", "first_seen_at": "2026-10-27T00:25:56+00:00"}]
---

# YesWiki: captured ActivityPub requests can be replayed to repeat actions

YesWiki's HTTP signature check on its ActivityPub inbox never validates the Date header or tracks seen signatures, so a signed request can be captured and sent again. An attacker who replays a signed Delete, Update, Follow or Undo activity can repeat those actions on the wiki.

_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 from 4.6.2 up to but not including 4.7.0 are affected.
- Confirm whether the ActivityPub actor inbox at `/api/forms/{formId}/actor/inbox` is reachable from the internet.

## Fix

- Upgrade YesWiki to `4.7.0` or later.

## Timeline

- 2026-10-27T00:25:56+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116825

## From the sources

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.

---

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