CVE-2026-81897

MEDIUMNVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. 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.

In Concrete CMS below CMS 9.5.3, the save_control action in the Express entities forms dashboard controller did not validate the anti-CSRF token. By causing an authenticated administrator to submit a forged cross-site request, a remote attacker without credentials could write attacker-controlled headline and body values to an existing Express form Text control. Those values were emitted without output encoding by the Express form Text element, so the injected markup executed as persistent JavaScript for any administrator who later opened the affected entry, resulting in stored cross-site scripting. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 7.7 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Yonatan Drori from Tenzai 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
5%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 22, 2026

References (1)

Vendor Advisories for CVE-2026-81897(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 30× 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 22:08 UTCEG score recompute
  2. 2026-09-24 22:08 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 20:51 UTCGHSA enrichment
  5. 2026-09-22 19:34 UTCGHSA enrichment
  6. 2026-09-22 18:34 UTCEG score recompute
  7. 2026-09-22 18:34 UTCGHSA enrichment
  8. 2026-09-22 16:01 UTCEPSS rescore
  9. 2026-09-21 21:09 UTCEPSS rescore
  10. 2026-09-21 19:21 UTCEG score recompute
  11. 2026-09-21 19:21 UTCGHSA enrichment
  12. 2026-09-20 20:16 UTCEPSS rescore
  13. 2026-09-20 18:04 UTCGHSA enrichment
  14. 2026-09-19 16:44 UTCEG score recompute
  15. 2026-09-19 16:44 UTCGHSA enrichment
  16. 2026-09-18 19:28 UTCEPSS rescore
  17. 2026-09-18 15:27 UTCEG score recompute▼ 2.30
  18. 2026-09-18 15:27 UTCGHSA enrichment
  19. 2026-09-18 15:23 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  20. 2026-09-18 10:50 UTCGHSA enrichment
  21. 2026-09-17 21:42 UTCEG score recompute
  22. 2026-09-17 21:42 UTCGHSA enrichment
  23. 2026-09-17 08:33 UTCGHSA enrichment
  24. 2026-09-16 19:24 UTCEG score recompute
  25. 2026-09-16 19:23 UTCGHSA enrichment
Show 5 more
  1. 2026-09-16 14:08 UTCEPSS rescore
  2. 2026-09-16 06:40 UTCGHSA enrichment
  3. 2026-09-15 17:32 UTCEG score recompute
  4. 2026-09-15 16:53 UTCEG score recompute
  5. 2026-09-15 16:52 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81897?
CVE-2026-81897 is a medium vulnerability published on September 15, 2026. In Concrete CMS below CMS 9.5.3, the save_control action in the Express entities forms dashboard controller did not validate the anti-CSRF token. By causing an authenticated administrator to submit a forged cross-site request, a remote attacker without credentials could write attacker-controlled…
When was CVE-2026-81897 disclosed?
CVE-2026-81897 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81897 actively exploited?
CVE-2026-81897 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 94.9% of all scored CVEs.
What is the CVSS score of CVE-2026-81897?
CVE-2026-81897 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-81897?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81897, 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.

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