VulnSocial

CVE-2025-4981Patch(mattermost / mattermost_server)

LOWCVSS 9.9 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch mattermost mattermost_server systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to sanitize filenames in the archive extractor which allows authenticated users to write files to arbitrary locations on the filesystem via uploading archives with path traversal sequences in filenames, potentially leading to remote code execution. The vulnerability impacts instances where file uploads and document search by content is enabled (FileSettings.EnableFileAttachments = true and FileSettings.ExtractContent = true). These configuration settings are enabled by default.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-427

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • mattermost_server

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 2 signals
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-03-13); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
mattermost
Products
mattermost_server

1 version affected across 1 product

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-03-13: 1Mentions · 2026-05-25: 1Patch / Workaround · 2026-03-13: 1Patch / Workaround · 2026-05-25: 1Technical Details · 2026-03-13: 1Technical Details · 2026-05-25: 103-1305-25
Signal classification2 categories
Patch
150.0%
Disclosure
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-03-131
Patch1
2026-05-251
Disclosure1
Full discourse2 posts
  • Hugo | DevOps | Cybersecurity 🇱🇻@HugoValters
    Disclosure

    CVE-2025-4981 - Critical RCE in Mattermost. Unpatched. CVSS 9.9. Archive upload path traversal allows arbitrary file write. Disable file uploads or restrict access immediately. #CVE #Mattermost #infosec #DevSecOps #DevOps more info: https://www.valtersit.com/cve/CVE-2025-4981/

    Post summary

    A newly identified, unpatched RCE vulnerability (CVE‑2025‑4981) in Mattermost allows arbitrary file writes via archive upload path traversal; users are urged to disable uploads or restrict access.

    00000204
    904 followersView on X
  • PulsePatch.io@pulsepatchio
    Patch

    Mattermost versions up to 10.5.5, 9.11.15, 10.8.0, 10.7.2, and 10.6.5 are vulnerable to arbitrary file write via unsanitized filenames in the archive extractor (CVE-2025-4981). Patching is recommended. #Mattermost #Infosec #CVE https://www.pulsepatch.io/posts/cve-2025-4981-mattermost-arbitrary-file-write

    Post summary

    CVE-2025-4981 allows arbitrary file writes in specified Mattermost versions due to unsanitized filenames in the archive extractor; patching is recommended.

    00000126
    1 followersView on X
CPE platform detail5 entries

5 of 5 entries

PartVendorProductVersionTarget SWTarget HW
Appmattermostmattermost_server---
Appmattermostmattermost_server10.8.0--
Appmattermostmattermost_server10.8.0--
Appmattermostmattermost_server10.8.0--
Appmattermostmattermost_server10.8.0--

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