CVE-2021-37859 | BDVDB-2026-158221 Detail

MattermostMattermost

Description#

Fixed a bypass for a reflected cross-site scripting vulnerability affecting OAuth-enabled instances of Mattermost.

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact low. Attack vector: network.

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

No public exploit known

7.1 High

3.2%, Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 88.6.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Cross-Site Scripting

No specific action is recorded in the source data. Check the references for vendor guidance.

Not available

7.1 High

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).