> CVE-2026-3495 [LOW]

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PUBLISHED
2026-05-18 08:16
MODIFIED
2026-05-18 08:16
CVSS_SCORE V3
3.8
EPSS (Prob. Exploit)
0.14%
Top 96.8%
DATA SOURCES:
NVD 🔗 2026-05-18 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-10-25 GITHUB 🔗 2026-11-05 OSV 🔗 2026-09-13

> DESCRIPTION

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622

> 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:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
EXPLOITABILITY
1.2
IMPACT
2.5

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
High (H)
Authentifié avec privilèges administratifs
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Unchanged (U)
Impact reste dans le périmètre 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-79

> CWE DETAILED DESCRIPTIONS

CWE-79: Improper Neutralization of Input During Web Page Generation - The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

> GITHUB SECURITY ADVISORY

GHSA-jx93-pf6x-874r LOW

Mattermost doesn't escape some variables that could contain malicious content during error page composition

AFFECTED PACKAGES:
GO / github.com/mattermost/mattermost-server
< 5.3.2-0.20260310115442-5a1ea95044dc
Fixed in: 5.3.2-0.20260310115442-5a1ea95044dc
GO / github.com/mattermost/mattermost/server/v8
< 8.0.0-20260310115442-5a1ea95044d
Fixed in: 8.0.0-20260310115442-5a1ea95044d
GO / github.com/mattermost/mattermost/server/v8
>= 11.5.0, < 11.5.2
Fixed in: 11.5.2
GO / github.com/mattermost/mattermost/server/v8
>= 10.11.0, < 10.11.14
Fixed in: 10.11.14

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Unescaped variables during error page composition

AFFECTED PACKAGES:
Unknown / Unknown
33 versions affected
ALIASES:
GHSA-jx93-pf6x-874r, GO-2026-5484

> HISTORIQUE DES MODIFICATIONS

Première apparition
18/05/2026 08:16
Source: NVD
📊 ENRICHISSEMENT 01/11/2026 06:59
CWE
Champ modifié: Description CWE
Ancienne valeur:
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') - The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in...
Nouvelle valeur:
CWE-79: Improper Neutralization of Input During Web Page Generation - The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a...
📊 ENRICHISSEMENT 01/06/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') - The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in...
Total des modifications: 2 Dernière mise à jour: 6 days ago

> REFERENCES

https://mattermost.com/security-updates
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