GHSA-92hr-gmr6-h8cp

Summary

Etherpad addressed weak token RNG, login timing, plugin path handling, API request handling

Severity

medium

CWE

CWE-22, CWE-208, CWE-209, CWE-235, CWE-330

Published

2026-08-17

Updated

2026-08-17

Advisory details

Fix: PR #7906 (ether/etherpad). A set of medium/low hardening fixes:

• Weak RNG for tokens (CWE-330): author/session/readonly IDs were generated with Math.random() (client and server). Now use crypto.getRandomValues.
• Login timing / no failure delay (CWE-208/CWE-307): the OIDC interaction login used a non-constant-time password compare with no failure delay. Now uses crypto.timingSafeEqual plus a uniform failure delay; user lookup is own-property only.
• Plugin dependency path handling (CWE-22): plugin dependency names from package.json were used to build filesystem paths without validation (admin-gated install). Now validated against the npm name grammar.
• API parameter pollution (CWE-235): /api/2 merged all request headers into the API field set. Now forwards only authorization, matching the openapi.ts handler.
• Pad-creation side effect: API.appendChatMessage could create arbitrary pads (missing getPadSafe). Now requires the pad to exist.
• Error info disclosure (CWE-209): the admin file server echoed filesystem error detail; now returns a generic message.

References

• https://github.com/advisories/GHSA-92hr-gmr6-h8cp
• https://github.com/ether/etherpad/security/advisories/GHSA-92hr-gmr6-h8cp
• https://github.com/ether/etherpad/pull/7906
• https://github.com/ether/etherpad/commit/7ea99706483443239bbbc0f2df9aff8ab5de4805
• https://github.com/ether/etherpad/releases/tag/3.3.0

Related advisories

• CVE-2026-112947 — medium · npm/vite
• CVE-2026-55090 — high · npm/ep_etherpad-lite
• CVE-2026-55088 — medium · npm/ep_etherpad-lite
• CVE-2026-55086 — medium · npm/ep_etherpad-lite
• CVE-2026-55087 — medium · npm/ep_etherpad-lite
• CVE-2026-114125 — critical · npm/storybook
• CVE-2026-61445 — critical · PyPI/praisonai
• CVE-2026-101894 — critical · npm/@xhmikosr/decompress

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