CVE-2026-123374 Apache Roller: Deserialization of untrusted data in weblog update ping responses
Anyone controlling a weblog update ping response can run code on Apache Roller servers via unsafe XML-RPC deserialization.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-123374?
CVE-2026-123374 is an unsafe deserialization vulnerability in Apache Roller, published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Deserialization of Untrusted Data vulnerability in Apache Roller. When Roller sends a weblog update ping, its XML-RPC client deserializes Java object data contained in the ping target's response, so a party that controls that response can run code in the Roller server process. This issue affects Apache Roller from 4.0 through 6.1.6. Users are recommended to upgrade to version 6.1.7, which removes the unsafe deserialization.
Weakness: CWE-502
Which versions are affected by CVE-2026-123374?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-123374?
No fix has been published for CVE-2026-123374 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-123374 being exploited?
There is no known exploitation of CVE-2026-123374 in the wild and no public exploit code.
Sources
Also known as GHSA-hrf9-352c-rrmj.