CVE-2026-77140

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 85% of all CVEs by exploit prediction. 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: epss, secondary
Trending — 4 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

The extension validates the HMAC of a frontend employee edit link only in the action that renders the edit form, not in the action that persists the change. An unauthenticated visitor who knows the UID of a visible employee record can send a direct POST request to the update action and overwrite that record without a valid edit link or any ownership check.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 27, 2026

Advisory Details (1)

Auto-updated Aug 25, 2026
No patch confirmed yet.
generic

TYPO3-EXT-SA-2026-018: Broken Access Control in extension "Telephone Directory" (telephonedirectory) - TYPO3 News

https://typo3.org/security/advisory/typo3-ext-sa-2026-018

Vendor Advisories for CVE-2026-77140(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 19× in last 7d / 19× 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. 2026-08-28 07:24 UTCEG score recompute
  2. 2026-08-28 07:24 UTCGHSA enrichment
  3. 2026-08-27 20:20 UTCEG score recompute
  4. 2026-08-27 20:20 UTCGHSA enrichment
  5. 2026-08-27 15:35 UTCGHSA enrichment
  6. 2026-08-27 04:30 UTCGHSA enrichment
  7. 2026-08-26 17:23 UTCEG score recompute
  8. 2026-08-26 17:23 UTCGHSA enrichment
  9. 2026-08-26 14:47 UTCEPSS rescore
  10. 2026-08-26 12:31 UTCGHSA enrichment
  11. 2026-08-26 01:24 UTCGHSA enrichment
  12. 2026-08-25 14:21 UTCEG score recompute
  13. 2026-08-25 14:21 UTCGHSA enrichment
  14. 2026-08-25 14:15 UTCEG score recompute
  15. 2026-08-25 14:15 UTCGHSA enrichment
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-25 09:22 UTCEG score recompute
  18. 2026-08-25 09:07 UTCEG score recompute
  19. 2026-08-25 09:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77140?
CVE-2026-77140 is a high vulnerability published on August 25, 2026. The extension validates the HMAC of a frontend employee edit link only in the action that renders the edit form, not in the action that persists the change. An unauthenticated visitor who knows the UID of a visible employee record can send a direct POST request to the update action and overwrite…
When was CVE-2026-77140 disclosed?
CVE-2026-77140 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77140 actively exploited?
CVE-2026-77140 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 85.2% of all scored CVEs.
What is the CVSS score of CVE-2026-77140?
CVE-2026-77140 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-77140?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77140, 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-2026-77140

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