JBoss RichFaces before 4.5.4 allows remote attackers to inject expression language (EL)…

JBoss RichFaces before 4.5.4 allows remote attackers to inject expression language (EL) expressions and execute arbitrary Java code via the do parameter.

CheckOps priority index

1.2/10 Patch within 7 days

Severity—

Probability0.4

Exploitation1/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 3.9% higher than 90.4% of CVEs

CVSS — not published

Exploited for 9 days 25 Oct 2026

Fixed packages 0 / 0 in open source registries

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 1 / 5

KEV catalog (CISA)no
Exploited in EUVD (ENISA)25 Oct 2026
Used by ransomwareno
EPSS above 10 %3.9%
No account, over the networkunknown

What to do

Fix

Apply the vendor’s fix as soon as it is available.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Affected products

The sources do not list the affected products yet.

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

26 Mar 2015
Published
25 Oct 2026
Exploitation reported (ENISA)