Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionality embeds user-supplied filenames into paths later passed to child_process.exec() for MIME-type detection. Because models/avatars.js and models/fileValidation.js used a shell command with the avatar filename, shell metacharacters such as backticks and $() in the filename could execute commands on the server. This issue is fixed in version 9.07.
CVE-2026-52891
CRITICALPre-NVD 9.99.9
EchelonGraph scoreLOW confidence
This critical-severity CVE scores 9.9 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: cna:github_m
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 9.9Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.9
- EG Score
- 9.9(low)
- EPSS
- —
- KEV
- Not listed
Published
July 15, 2026
Last Modified
July 15, 2026
Advisory Details (3)
Auto-updated Jul 15, 2026Patch available. Sources: github_commit, github_release, github.
github Patch Available
Wekan: Shell Injection via Avatar Upload · Advisory · wekan/wekan · GitHub
https://github.com/wekan/wekan/security/advisories/GHSA-35j7-h385-2q9ggithub_release Patch Available
v9.07
Patch available: wekan/wekan v9.07
https://github.com/wekan/wekan/releases/tag/v9.07github_commit
commit a4c74a5980e9 (wekan/wekan)
Fix landed in wekan/wekan commit a4c74a5980e9 — awaiting tagged release
https://github.com/wekan/wekan/commit/a4c74a5980e9f778eb444fd346f32aa3d16786a9Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-15 21:24 UTCEG score recompute
- 2026-07-15 21:23 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-78
- CVE-2009-20011EG 10.0CRITICAL
- CVE-2011-10017EG 10.0CRITICAL
- CVE-2011-10026EG 9.8CRITICAL
- CVE-2011-2195EG 9.8CRITICAL
- CVE-2011-2523EG 9.8EPSS 100%CRITICAL
- CVE-1999-0043EG 9.8EPSS 99%CRITICAL
- CVE-2009-20010EG 9.3CRITICAL
- CVE-2010-20059EG 9.3CRITICAL
- CVE-2010-10013EG 9.3CRITICAL
- CVE-2010-1885NVD 0.0EG 9.0EPSS 99%NONE
Frequently asked(4)
What is CVE-2026-52891?
CVE-2026-52891 is a critical vulnerability published on July 15, 2026. Wekan is open source kanban built with Meteor. Prior to 9.07, Wekan avatar upload functionality embeds user-supplied filenames into paths later passed to child_process.exec() for MIME-type detection. Because models/avatars.js and models/fileValidation.js used a shell command with the avatar…
When was CVE-2026-52891 disclosed?
CVE-2026-52891 was first published in the National Vulnerability Database on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-52891?
CVE-2026-52891 has a CVSS v3 base score of 9.9 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-52891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-52891, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-52891
Is Your Infrastructure Affected by CVE-2026-52891?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.