CVE-2026-19867
CVE-2026-19867 · Uncapped mention keys in user notification properties allow CPU exhaustion during post processing
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Mattermost versions 11.10.x <= 11.10.0, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10 fail to cap the number and size of mention keys stored in a user's notification properties, and to bound the quadratic multibyte-keyword matching performed for each post, which allows an authenticated user to degrade post-processing latency and consume excessive CPU on behalf of other members of any channel they share via storing an oversized notify_props.mention_keys list on their own profile.. Mattermost Advisory ID: MMSA-2026-00773
CVSS 4.3 · Moyenne · EPSS 0,2% · Correctif disponible
- Publication
- Mise à jour
Produits et versions concernés
mattermost
- Versions du logiciel
- ≥ 11.10.0, ≤ 11.10.0: Concernée (semver)
- ≥ 11.9.0, ≤ 11.9.1: Concernée (semver)
- ≥ 11.8.0, ≤ 11.8.5: Concernée (semver)
- ≥ 11.7.0, ≤ 11.7.10: Concernée (semver)
- 11.11.0: Non concernée
- 11.10.1: Non concernée
- 11.9.2: Non concernée
- 11.8.6: Non concernée
- 11.7.11: Non concernée
Mettez à jour vers 11.10.1; Mettez à jour vers 11.7.11; Mettez à jour vers 11.8.6; Mettez à jour vers 11.9.2