TI-2026-39792 Aliases CVE-2026-55088 GHSA-vqfp-p66c-xrp9

Information disclosure in etherpad

LOW 32CWE-200Published 2026-08-19 · Updated 2026-08-21

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: High
Impact type: Information disclosure, Security bypass
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-200 and CWE-294.

Summary

Etherpad is a real-time collaborative editor. From 2.6.0 until 3.1.0, Etherpad's src/node/hooks/express/tokenTransfer.ts uses POST /tokenTransfer to store an author token for transfer between browsers and exposes it through GET /tokenTransfer/{uuid}. Although the record includes createdAt, the transfer has no expiration check, is not removed after successful redemption, and is returned by res.send(tokenData), including the raw author token. An unauthenticated attacker who obtains a transfer UUID can repeatedly redeem it, receive fresh author cookies, read the cleartext token, and impersonate the originating author for pad read and write operations. This issue is fixed in version 3.1.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00439 38th percentileScored 2026-11-07

Fix Fixed etherpad (ether): 3.1.0ep_etherpad-lite (npm): 3.1.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ether	etherpad	2.6.0 to before 3.1.0	3.1.0	Patch available	CNA
—	ep_etherpad-lite (npm)	2.6.0 to before 3.1.0	3.1.0	Patch available	GHSA-vqfp-p66c-xrp9

etherpad Vendorether Affected 2.6.0 to before 3.1.0 Fixed in 3.1.0 Patch available CNA
ep_etherpad-lite (npm) Vendor— Affected 2.6.0 to before 3.1.0 Fixed in 3.1.0 Patch available GHSA-vqfp-p66c-xrp9

Remediation

Fix · CNA etherpad (ether) Fixed in 3.1.0
Fix · GHSA-vqfp-p66c-xrp9 ep_etherpad-lite (npm) Fixed in 3.1.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-55088
2026-10-03 Alias added: GHSA-vqfp-p66c-xrp9

References

Other 5

TI-2026-39793 Etherpad: JWT `admin` claim presence-only check lets non-admin OAuth users invoke every Etherpad HTTP API endpoint CVSS 3.1CRITICAL 9.9
TI-2026-39789 Etherpad: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in etherpad-lite CVSS 3.1CRITICAL 9.6
TI-2026-39790 Link following in etherpad CVSS 3.1MEDIUM 4.2
TI-2009-04910 Session fixation in ether Catalyst::Plugin::Authentication CVSS 3.1CRITICAL 9.1
TI-2025-27313 Catalyst::Authentication::Credential::HTTP versions 1.018 and earlier for Perl use insecurely generated nonces CVSS 3.1HIGH 8.6
TI-2026-39794 Etherpad: Stored XSS in HTML export via unescaped attribute-pool values CVSS 4.0MEDIUM 5.3

See all 7 →

Sources

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