CVE-2026-15747

CRITICALPre-NVD 9.1Trending — 4 sources updated this week
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 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
0.0(none)
EPSS
4.8%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 15, 2026

Advisory Details (3)

Auto-updated Jul 15, 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.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 7× 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. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:54 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  3. 2026-07-14 21:22 UTCNVD update
  4. 2026-07-14 20:01 UTCMITRE cvelistV5
  5. 2026-07-14 19:21 UTCNVD update
  6. 2026-07-14 17:47 UTCEG score recompute
  7. 2026-07-14 17:40 UTCMITRE cvelistV5first tracked

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 4.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 0.0.
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.

Dependency Blast Radius

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