CVE-2026-40909

HIGHNVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

Score 8.7 from GitHub Security Advisory (severity: HIGH) published 2026-04-14. NVD baseline CVSS 8.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.7Exploit: NoneExposed: 0

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

WWBN AVideo is an open source video platform. In versions 29.0 and prior, the locale save endpoint (locale/save.php) constructs a file path by directly concatenating $_POST['flag'] into the path at line 30 without any sanitization. The $_POST['code'] parameter is then written verbatim to that path via fwrite() at line 40. An admin attacker (or any user who can CSRF an admin, since no CSRF token is checked and cookies use SameSite=None) can traverse out of the locale/ directory and write arbitrary .php files to any writable location on the filesystem, achieving Remote Code Execution. Commit 57f89ffbc27d37c9d9dd727212334846e78ac21a fixes the issue.

CVSS v3
8.7
EG Score
8.7(medium)
EPSS
47.2%
KEV
Not listed

Published

April 21, 2026

Last Modified

April 23, 2026

Advisory Details (2)

Auto-updated May 3, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Path Traversal in Locale Save Endpoint Enables Arbitrary PHP File Write to Any Web-Accessible Directory (RCE) · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-6rc6-p838-686f
generic

fix: Validate global token and improve error handling in save.php · WWBN/AVideo@57f89ff · GitHub

https://github.com/WWBN/AVideo/commit/57f89ffbc27d37c9d9dd727212334846e78ac21a

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
composerwwbn/avideo—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
wwbn/avideo10.4 ... 29.0 (18 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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 124 total refreshes for this CVE.

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

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-40909?
CVE-2026-40909 is a high vulnerability published on April 21, 2026. WWBN AVideo is an open source video platform. In versions 29.0 and prior, the locale save endpoint (locale/save.php) constructs a file path by directly concatenating $POST['flag'] into the path at line 30 without any sanitization. The $POST['code'] parameter is then written verbatim to that path…
When was CVE-2026-40909 disclosed?
CVE-2026-40909 was first published in the National Vulnerability Database on April 21, 2026, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40909 actively exploited?
CVE-2026-40909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40909?
CVE-2026-40909 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-40909?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40909, 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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