Is CVE-2026-33204 actively exploited?

No active exploitation of CVE-2026-33204 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33204 be exploited remotely?

Yes. CVE-2026-33204 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33204?

CVE-2026-33204 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-33204

CWE-400Published: March 20, 2026· Updated: Mar 23, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.2th

Official Description

SimpleJWT is a simple JSON web token library written in PHP. Prior to version 1.1.1, an unauthenticated attacker can perform a Denial of Service via JWE header tampering when PBES2 algorithms are used. Applications that call JWE::decrypt() on attacker-controlled JWEs using PBES2 algorithms are affected. This issue has been patched in version 1.1.1.

NVD Source

Technical Analysis

CVE-2026-33204 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 availability disruption (denial of service), with a CVSS base score of 7.5.