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 64% 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 — 3 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
36%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Sep 14, 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 54× in last 7d / 218× 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.

Showing the most recent 100 of 218 total refreshes for this CVE.

  1. 2026-09-21 07:40 UTCGHSA enrichment
  2. 2026-09-21 03:26 UTCGHSA enrichment
  3. 2026-09-20 23:44 UTCEG score recompute
  4. 2026-09-20 23:43 UTCGHSA enrichment
  5. 2026-09-20 20:16 UTCEPSS rescore
  6. 2026-09-20 20:00 UTCGHSA enrichment
  7. 2026-09-20 16:18 UTCGHSA enrichment
  8. 2026-09-20 12:36 UTCGHSA enrichment
  9. 2026-09-20 08:42 UTCGHSA enrichment
  10. 2026-09-20 03:32 UTCGHSA enrichment
  11. 2026-09-19 23:50 UTCGHSA enrichment
  12. 2026-09-19 20:08 UTCGHSA enrichment
  13. 2026-09-19 16:25 UTCEG score recompute
  14. 2026-09-19 16:25 UTCGHSA enrichment
  15. 2026-09-19 12:43 UTCGHSA enrichment
  16. 2026-09-19 08:56 UTCGHSA enrichment
  17. 2026-09-19 04:59 UTCGHSA enrichment
  18. 2026-09-19 01:16 UTCGHSA enrichment
  19. 2026-09-18 21:34 UTCEG score recompute
  20. 2026-09-18 21:34 UTCGHSA enrichment
  21. 2026-09-18 19:28 UTCEPSS rescore
  22. 2026-09-18 16:22 UTCGHSA enrichment
  23. 2026-09-18 12:08 UTCGHSA enrichment
  24. 2026-09-18 08:24 UTCGHSA enrichment
  25. 2026-09-18 04:35 UTCGHSA enrichment
Show 75 more
  1. 2026-09-18 00:52 UTCGHSA enrichment
  2. 2026-09-17 21:09 UTCEG score recompute
  3. 2026-09-17 21:09 UTCGHSA enrichment
  4. 2026-09-17 14:38 UTCGHSA enrichment
  5. 2026-09-17 10:52 UTCGHSA enrichment
  6. 2026-09-17 07:04 UTCGHSA enrichment
  7. 2026-09-17 03:21 UTCGHSA enrichment
  8. 2026-09-16 23:10 UTCGHSA enrichment
  9. 2026-09-16 19:27 UTCGHSA enrichment
  10. 2026-09-16 14:14 UTCEG score recompute
  11. 2026-09-16 14:14 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 09:45 UTCGHSA enrichment
  14. 2026-09-16 06:02 UTCEG score recompute
  15. 2026-09-16 06:02 UTCGHSA enrichment
  16. 2026-09-16 05:15 UTCEPSS rescore
  17. 2026-09-16 02:19 UTCGHSA enrichment
  18. 2026-09-15 22:36 UTCGHSA enrichment
  19. 2026-09-15 18:53 UTCGHSA enrichment
  20. 2026-09-15 15:11 UTCGHSA enrichment
  21. 2026-09-15 11:26 UTCGHSA enrichment
  22. 2026-09-15 07:44 UTCGHSA enrichment
  23. 2026-09-15 04:02 UTCEG score recompute
  24. 2026-09-15 04:02 UTCGHSA enrichment
  25. 2026-09-15 03:12 UTCEPSS rescore
  26. 2026-09-15 00:19 UTCGHSA enrichment
  27. 2026-09-14 20:37 UTCGHSA enrichment
  28. 2026-09-14 16:54 UTCGHSA enrichment
  29. 2026-09-14 13:12 UTCGHSA enrichment
  30. 2026-09-14 09:29 UTCGHSA enrichment
  31. 2026-09-14 05:47 UTCGHSA enrichment
  32. 2026-09-14 02:04 UTCGHSA enrichment
  33. 2026-09-13 22:21 UTCGHSA enrichment
  34. 2026-09-13 18:39 UTCEG score recompute
  35. 2026-09-13 18:39 UTCGHSA enrichment
  36. 2026-09-13 14:57 UTCGHSA enrichment
  37. 2026-09-13 11:09 UTCGHSA enrichment
  38. 2026-09-13 07:26 UTCGHSA enrichment
  39. 2026-09-13 03:44 UTCGHSA enrichment
  40. 2026-09-13 00:00 UTCGHSA enrichment
  41. 2026-09-12 20:18 UTCGHSA enrichment
  42. 2026-09-12 16:36 UTCEG score recompute
  43. 2026-09-12 16:36 UTCGHSA enrichment
  44. 2026-09-12 15:02 UTCEPSS rescore
  45. 2026-09-12 12:54 UTCGHSA enrichment
  46. 2026-09-12 09:12 UTCGHSA enrichment
  47. 2026-09-12 05:29 UTCGHSA enrichment
  48. 2026-09-12 01:47 UTCGHSA enrichment
  49. 2026-09-11 22:05 UTCGHSA enrichment
  50. 2026-09-11 18:23 UTCEG score recompute
  51. 2026-09-11 18:23 UTCGHSA enrichment
  52. 2026-09-11 14:53 UTCEPSS rescore
  53. 2026-09-11 14:40 UTCGHSA enrichment
  54. 2026-09-11 10:58 UTCEG score recompute
  55. 2026-09-11 10:58 UTCGHSA enrichment
  56. 2026-09-11 06:37 UTCGHSA enrichment
  57. 2026-09-11 02:54 UTCGHSA enrichment
  58. 2026-09-10 23:12 UTCGHSA enrichment
  59. 2026-09-10 19:30 UTCGHSA enrichment
  60. 2026-09-10 15:48 UTCGHSA enrichment
  61. 2026-09-10 12:06 UTCEG score recompute
  62. 2026-09-10 12:06 UTCGHSA enrichment
  63. 2026-09-10 09:35 UTCEPSS rescore
  64. 2026-09-10 07:54 UTCGHSA enrichment
  65. 2026-09-10 04:11 UTCGHSA enrichment
  66. 2026-09-10 00:19 UTCGHSA enrichment
  67. 2026-09-09 17:03 UTCGHSA enrichment
  68. 2026-09-09 12:24 UTCGHSA enrichment
  69. 2026-09-09 08:42 UTCGHSA enrichment
  70. 2026-09-09 04:59 UTCGHSA enrichment
  71. 2026-09-09 01:17 UTCEG score recompute
  72. 2026-09-09 01:17 UTCGHSA enrichment
  73. 2026-09-08 22:01 UTCEPSS rescore
  74. 2026-09-08 06:39 UTCGHSA enrichment
  75. 2026-09-08 02:56 UTCGHSA enrichment

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 63.8% 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.

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