CVE-2026-81917

MEDIUMNVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-09-11. NVD baseline CVSS 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Concrete CMS below 9.5.3 does not apply HTML output escaping to the file description and tags fields when rendering the Document Library block, so a user with permission to edit file properties could store a script payload that executed in the browser of any visitor to a page displaying the block with the description or tags column enabled, including unauthenticated visitors. Successful exploitation could allow theft of session data or actions performed in the visitor's context. The block controller returned the description and tags values without the h() escaping already applied to the title column, and the block view template wrote the returned value directly into the results table The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 5.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N. Thanks Nguyen Manh Thuan for reporting.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 18, 2026

References (1)

Vendor Advisories for CVE-2026-81917(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 42× 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.

  1. 2026-09-24 20:04 UTCEG score recompute
  2. 2026-09-24 20:04 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 19:25 UTCEG score recompute
  5. 2026-09-23 19:25 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-22 18:15 UTCEG score recompute
  8. 2026-09-22 18:15 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-21 21:09 UTCEPSS rescore
  11. 2026-09-21 17:36 UTCEG score recompute
  12. 2026-09-21 17:35 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 16:48 UTCGHSA enrichment
  15. 2026-09-19 16:08 UTCEG score recompute
  16. 2026-09-19 16:08 UTCGHSA enrichment
  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-18 15:27 UTCEG score recompute▲ 0.30
  19. 2026-09-18 15:27 UTCGHSA enrichment
  20. 2026-09-18 15:23 UTCNVD updateCVSS v3 → 5.4
  21. 2026-09-17 19:37 UTCEG score recompute
  22. 2026-09-17 19:37 UTCGHSA enrichment
  23. 2026-09-16 15:41 UTCEG score recompute
  24. 2026-09-16 15:41 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 17 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 15:01 UTCGHSA enrichment
  3. 2026-09-15 14:09 UTCEG score recompute
  4. 2026-09-15 14:09 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-14 13:29 UTCEG score recompute
  8. 2026-09-14 13:29 UTCGHSA enrichment
  9. 2026-09-14 13:10 UTCEG score recompute
  10. 2026-09-14 13:10 UTCGHSA enrichment
  11. 2026-09-13 22:40 UTCEG score recompute
  12. 2026-09-13 22:40 UTCGHSA enrichment
  13. 2026-09-12 22:01 UTCEG score recompute
  14. 2026-09-12 22:01 UTCGHSA enrichment
  15. 2026-09-11 21:21 UTCEG score recompute
  16. 2026-09-11 20:29 UTCEG score recompute
  17. 2026-09-11 20:28 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81917?
CVE-2026-81917 is a medium vulnerability published on September 11, 2026. Concrete CMS below 9.5.3 does not apply HTML output escaping to the file description and tags fields when rendering the Document Library block, so a user with permission to edit file properties could store a script payload that executed in the browser of any visitor to a page displaying the block…
When was CVE-2026-81917 disclosed?
CVE-2026-81917 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81917 actively exploited?
CVE-2026-81917 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 86.9% of all scored CVEs.
What is the CVSS score of CVE-2026-81917?
CVE-2026-81917 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-81917?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81917, 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

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