CVE-2026-77138

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 65% 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
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: None knownExposed: 0

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

The extension fails to safely process untrusted client input of an attacker-controlled cookie directly to PHP's unserialize(). A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server.

CVSS v3
9.3
EG Score
9.3(medium)
EG Risk
57(Track)
EG Risk 57/100SSVC: 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
Severity93% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 26, 2026

Advisory Details (1)

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

TYPO3-EXT-SA-2026-014: Remote Code Execution in extension "HTML5 Video Player vs. Powermail" (html5videoplayer_powermail) - TYPO3 News

https://typo3.org/security/advisory/typo3-ext-sa-2026-014

Vendor Advisories for CVE-2026-77138(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 39× in last 7d / 39× 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. 2026-08-29 07:45 UTCGHSA enrichment
  2. 2026-08-29 04:00 UTCGHSA enrichment
  3. 2026-08-29 00:18 UTCEG score recompute
  4. 2026-08-29 00:18 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 18:01 UTCGHSA enrichment
  7. 2026-08-28 14:10 UTCGHSA enrichment
  8. 2026-08-28 10:25 UTCGHSA enrichment
  9. 2026-08-28 06:39 UTCGHSA enrichment
  10. 2026-08-28 02:56 UTCGHSA enrichment
  11. 2026-08-27 23:14 UTCGHSA enrichment
  12. 2026-08-27 19:32 UTCGHSA enrichment
  13. 2026-08-27 15:50 UTCEG score recompute
  14. 2026-08-27 15:50 UTCGHSA enrichment
  15. 2026-08-27 14:25 UTCEPSS rescore
  16. 2026-08-27 12:06 UTCGHSA enrichment
  17. 2026-08-27 08:22 UTCGHSA enrichment
  18. 2026-08-27 04:37 UTCGHSA enrichment
  19. 2026-08-27 00:52 UTCGHSA enrichment
  20. 2026-08-26 21:09 UTCGHSA enrichment
  21. 2026-08-26 17:23 UTCGHSA enrichment
  22. 2026-08-26 16:24 UTCEG score recompute
  23. 2026-08-26 16:24 UTCGHSA enrichment
  24. 2026-08-26 14:47 UTCEPSS rescore
  25. 2026-08-26 12:37 UTCGHSA enrichment
Show 14 more
  1. 2026-08-26 08:53 UTCGHSA enrichment
  2. 2026-08-26 05:11 UTCGHSA enrichment
  3. 2026-08-26 01:28 UTCGHSA enrichment
  4. 2026-08-25 21:46 UTCGHSA enrichment
  5. 2026-08-25 18:03 UTCGHSA enrichment
  6. 2026-08-25 14:21 UTCEG score recompute
  7. 2026-08-25 14:21 UTCGHSA enrichment
  8. 2026-08-25 14:15 UTCEG score recompute
  9. 2026-08-25 14:15 UTCGHSA enrichment
  10. 2026-08-25 13:49 UTCEPSS rescore
  11. 2026-08-25 13:07 UTCGHSA enrichment
  12. 2026-08-25 09:22 UTCEG score recompute
  13. 2026-08-25 09:07 UTCEG score recompute
  14. 2026-08-25 09:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-77138?
CVE-2026-77138 is a critical vulnerability published on August 25, 2026. The extension fails to safely process untrusted client input of an attacker-controlled cookie directly to PHP's unserialize(). A remote, unauthenticated attacker can supply a crafted serialized payload to trigger PHP Object Injection, leading to Remote Code Execution on the TYPO3 server.
When was CVE-2026-77138 disclosed?
CVE-2026-77138 was first published in the National Vulnerability Database on August 25, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77138 actively exploited?
CVE-2026-77138 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 64.9% of all scored CVEs.
What is the CVSS score of CVE-2026-77138?
CVE-2026-77138 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-77138?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77138, 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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