> CVE-2026-55086 [MEDIUM]

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PUBLISHED
2026-08-19 20:17
MODIFIED
2026-08-19 20:17
CVSS_SCORE V3
4.2
EPSS (Prob. Exploit)
0.14%
Top 97.1%
DATA SOURCES:
NVD 🔗 2026-08-19 CWE MITRE 🔗 2026-09-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-10-29 OSV 🔗 2026-08-26

> DESCRIPTION

Etherpad is a real-time collaborative editor. Prior to 3.1.0, src/node/handler/ImportHandler.ts and src/node/handler/ExportHandler.ts derive temporary filenames from Math.random() and place them in os.tmpdir(). On a host with a shared world-writable temporary directory, a local unprivileged attacker who predicts a filename can precreate a symbolic link to a file writable by the Etherpad process. Subsequent import or export operations can follow the link through fs.writeFile, fs.rename, or document-conversion output and overwrite the target with partially attacker-controlled content. This issue is fixed in version 3.1.0.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
EXPLOITABILITY
1.1
IMPACT
2.7

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Local (L)
Exploit nécessite un accès local au système
AC (Complexité d'Attaque)
Attack Complexity
High (H)
Conditions spécifiques doivent être réunies pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Changed (C)
Impact s'étend au-delà du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
Low (L)
Divulgation limitée d'informations
I (Impact Intégrité)
Integrity Impact
Low (L)
Modification limitée des données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
Low
Divulgation limitée d'informations
Intégrité
Low
Modification limitée des données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-59 CWE-377

> CWE DETAILED DESCRIPTIONS

CWE-59: Improper Link Resolution Before File Access ('Link Following') - The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. | CWE-377: Insecure Temporary File - Creating and using insecure temporary files can leave application and system data vulnerable to attack.

> GITHUB SECURITY ADVISORY

GHSA-2jwf-f4xq-f24h MODERATE

ep_etherpad-lite: Import/export uses Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite

AFFECTED PACKAGES:
NPM / ep_etherpad-lite
<= 3.0.0
Fixed in: 3.1.0

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Etherpad: Import/export use Math.random() for temp file paths; predictable paths on shared /tmp enable symlink-based file overwrite

AFFECTED PACKAGES:
Unknown / Unknown
118 versions affected
ALIASES:
GHSA-2jwf-f4xq-f24h

> HISTORIQUE DES MODIFICATIONS

Première apparition
19/08/2026 20:17
Source: NVD
📊 ENRICHISSEMENT 01/09/2026 06:02
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-59: Improper Link Resolution Before File Access ('Link Following') - The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a ...
Total des modifications: 1 Dernière mise à jour: 1 month ago

> REFERENCES

https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d99...
https://github.com/ether/etherpad/pull/7784
https://github.com/ether/etherpad/releases/tag/v3.1.0
https://github.com/ether/etherpad/security/advisories/GHSA-2jwf-f4xq-f24h
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