CVE-2025-35939

CRITICALNVD 5.39.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-06-02), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.3 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 5.3Exploit: cisa kev · ssvc activeExposed: 0

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

Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed, possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at '/var/lib/php/sessions'. Such session files are named 'sess_[session_value]', where '[session_value]' is provided to the client in a 'Set-Cookie' response header. Craft CMS stores the return URL requested by the client without sanitizing parameters. Consequently, an unauthenticated client can introduce arbitrary values, such as PHP code, to a known local file location on the server. Craft CMS versions 5.7.5 and 4.15.3 have been released to address this issue.

CVSS v3
5.3
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
64%
KEV
⚠ Exploited

Published

May 7, 2025

Last Modified

October 24, 2025

Advisory Details (6)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_pr, github_release, cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-35939
generic
https://www.cve.org/CVERecord?id=CVE-2025-35939
generic
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-147-01.json
github_release Patch Available

5.7.5

Patch available: craftcms/cms 5.7.5

https://github.com/craftcms/cms/releases/tag/5.7.5
github_release Patch Available

4.15.3

Patch available: craftcms/cms 4.15.3

https://github.com/craftcms/cms/releases/tag/4.15.3
github_pr Patch Available

Return URLs saved into session are now sanitized

Patch available: craftcms/cms 4.17.11 (PR #17220 merged 2025-05-05)

https://github.com/craftcms/cms/pull/17220

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
craftcms/cms1.0.26.1 ... 4.9.7 (1043 versions)4.15.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 67× 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 126 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2025-35939?
CVE-2025-35939 is a critical vulnerability published on May 7, 2025. Craft CMS stores arbitrary content provided by unauthenticated users in session files. This content could be accessed and executed, possibly using an independent vulnerability. Craft CMS redirects requests that require authentication to the login page and generates a session file on the server at…
When was CVE-2025-35939 disclosed?
CVE-2025-35939 was first published in the National Vulnerability Database on May 7, 2025, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-35939 actively exploited?
Yes. CISA added CVE-2025-35939 to the Known Exploited Vulnerabilities catalog on June 2, 2025, affecting Craft CMS Craft CMS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2025-35939?
CVE-2025-35939 has a CVSS v3 base score of 5.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2025-35939?
CVE-2025-35939 affects Craft CMS Craft CMS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2025-35939?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-35939, 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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