CVE-2026-15747

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle.

_csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden csrf_token input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle.

An attacker able to query it can recover the token and pass csrf_protect validation.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 15, 2026

Advisory Details (3)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-15747: Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle

http://www.openwall.com/lists/oss-security/2026/07/14/16
generic

Changes - metacpan.org

https://metacpan.org/release/SRI/Mojolicious-9.48/changes
generic
https://github.com/mojolicious/mojo/commit/01921fbbbbeca2d1397e082d4a647f9b84c24e27.patch

Vendor Advisories for CVE-2026-15747(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libmojolicious-perl8.71+dfsg-1 ... 9.48+dfsg-1 (29 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libmojolicious-perl9.31+dfsg-1 ... 9.48+dfsg-1 (18 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libmojolicious-perl9.39+dfsg-1 ... 9.48+dfsg-1 (8 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libmojolicious-perl9.39+dfsg-1 ... 9.47+dfsg-1 (7 versions)9.48+dfsg-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 33× in last 7d / 215× 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 276 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15747?
CVE-2026-15747 is a critical vulnerability published on July 14, 2026. Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle. csrftoken generates and caches one token per session and returns the same value on every call, and csrffield places that value in a hidden csrf_token input.…
When was CVE-2026-15747 disclosed?
CVE-2026-15747 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15747 actively exploited?
CVE-2026-15747 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 83.2% of all scored CVEs.
What is the CVSS score of CVE-2026-15747?
CVE-2026-15747 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-15747?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15747, 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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