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TI-2026-80226 Aliases CVE-2026-116208GHSA-wpv5-x9h8-8qxg

Missing authorization in YesWiki ActivityPub sync lets servers alter entries

Priority HIGH 65CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

YesWiki from 4.6.2 before 4.7.0 contains a missing authorization flaw (CWE-862) in ActivityPubService::syncActorPosts. A malicious ActivityPub server can manipulate mirrored entries that belong to other actors. An attacker can serve a poisoned outbox with cross-actor Delete, Update, or Create activities during an admin-initiated sync, which lets them delete, overwrite, forge, or mass-delete entries. User interaction is required because an administrator must start the sync.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00242 15th percentileScored 2026-11-07
Fix Fixed yeswiki (YesWiki): 4.7.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
YesWikiyeswiki4.6.2 to before 4.7.04.7.0Patch availableCNA
  • yeswiki VendorYesWiki Affected 4.6.2 to before 4.7.0 Fixed in 4.7.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:yeswiki:yeswiki:*:*:*:*:*:*:*:*——YesWiki
  • cpe:2.3:a:yeswiki:yeswiki:*:*:*:*:*:*:*:* Versions — — ·YesWiki

Remediation

Upgrade YesWiki to version 4.7.0 or later, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA yeswiki (YesWiki) Fixed in 4.7.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    yeswiki 4.7.0

    8 records Highest priority Priority HIGH 4 HIGH, 3 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-80227 SQL injection in YesWiki Bazar entry creation via date_maj_fichePriority HIGH 77
    • TI-2026-80223 Unauthenticated SSRF in YesWiki via raw-inclusion wiki syntaxPriority HIGH 70
    • TI-2026-80222 Cross-site request forgery in YesWiki despam actionPriority HIGH 65
    Show all 8 records →

Timeline

  1. 2026-10-25 Threatist record created from CVE-2026-116208
  2. 2026-10-26 Priority changed: MEDIUM → LOW
  3. 2026-10-27 Alias added: GHSA-wpv5-x9h8-8qxg
  4. 2026-11-03 CISA SSVC decision points changed
  5. 2026-11-03 Priority changed: LOW → HIGH

References

Advisory 1

  • TI-2026-37893 YesWiki has Unsafe eval() in Formula Calculator - Remote Code Execution (RCE) & Denial of Service (DoS) CVSS 3.1CRITICAL 9.8
  • TI-2026-34305 YesWiki: Unauthenticated SQL Injection CVSS 3.1CRITICAL 9.8
  • TI-2025-29089 YesWiki Vulnerable to Unauthenticated Site Backup Creation and Download CVSS 3.1CRITICAL 10.0
  • TI-2024-34399 Use of a Broken or Risky Cryptographic Algorithm in YesWiki CVSS 3.1CRITICAL 9.9
  • TI-2026-37882 YesWiki: Unauthenticated arbitrary page deletion via `{{erasespamedcomments}}` action CVSS 3.1CRITICAL 9.1
  • TI-2026-80227 SQL injection in YesWiki Bazar entry creation via date_maj_fiche CVSS 4.0HIGH 8.8
See all 85 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences