# CVE-2026-116825: YesWiki HTTP Signature replay protection missing in ActivityPub inbox

Source: https://junglewise.ai/threats/cve-2026-116825-yeswiki-from-4-6-2-before-4-7-0-lacks-replay-protection-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-27. Updated: 2026-10-27  
License: CC BY 4.0 with a link back

CVE-2026-116825 · Severity: medium · CVSS 6.5 · Published 2026-10-27

YesWiki is a wiki platform that supports ActivityPub federation for collaborative editing across websites. The application fails to validate timestamps or track previously-seen signatures, allowing an attacker who captures a signed request to replay it indefinitely to re-execute delete, update, follow, or undo actions on behalf of the original sender. This could enable persistent data loss, content corruption, or unwanted subscriptions.

Technologies: [YesWiki](https://junglewise.ai/threats/technologies/yeswiki). Vendors: [YesWiki](https://junglewise.ai/threats/vendors/yeswiki).

## Quick answers

**Is CVE-2026-116825 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-116825 being exploited in the wild.

**How severe is CVE-2026-116825?** Medium severity, with a CVSS score of 6.5, published 27 October 2026.

**Which products and versions are affected?** YesWiki 4.6.2 before 4.7.0.

**Is there a fix for CVE-2026-116825?** Yes: fixed in 4.7.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-116825 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-116825?** Check whether you run YesWiki at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 4.7.0

## Technical details

HttpSignatureService::verifySignature() validates cryptographic integrity and body digest but never compares the Date header against current server time and maintains no nonce or seen-signature tracking. An attacker with access to historical HTTP request logs (reverse proxy, WAF, shared hosting, or debug output) can replay a captured signed POST to /api/forms/{formId}/actor/inbox with no time window restriction, since ActivityPub keys persist indefinitely. The public inbox endpoint has no authentication requirement, and re-executed actions pass all ownership checks because they originate from the legitimate actor that originally signed them.

## Affected products

- YesWiki YesWiki 4.6.2 before 4.7.0

## Timeline

- 2026-10-12: disclosed
- 2026-10-27: advisory

## References

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

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- [YesWiki server-side request forgery in Bazar CSV import](https://junglewise.ai/threats/cve-2026-116827-yeswiki-before-4-7-0-contains-a-server-side-request-forgery)
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- [YesWiki reflected cross-site scripting in Bazar field rendering](https://junglewise.ai/threats/cve-2026-116823-yeswiki-before-4-7-0-contains-a-reflected-cross-site-scripting)