Is CVE-2026-15747 actively exploited?

No active exploitation of CVE-2026-15747 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-15747 be exploited remotely?

Yes. CVE-2026-15747 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-15747?

CVE-2026-15747 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2026-15747

CWE-204Published: July 14, 2026· Updated: Jul 15, 2026

9.1

CVSS v3.1

Official Description

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.

NVD Source

Risk Analysis

This critical vulnerability in Mojolicious for Perl exposes a stable session CSRF token to a BREACH compression oracle. With a CVSS score of 9.1, an attacker could recover the token and bypass CSRF protection, leading to unauthorized actions. No user interaction is required for exploitation.

No public exploits are currently known for this vulnerability. The flaw is remotely exploitable with low complexity, making it a significant concern.

Recommended Action

Users of Mojolicious should update to version 9.48 or later. Implement strong encryption and ensure proper handling of sensitive tokens to prevent compression oracle attacks.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-15747 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 9.1.