Is CVE-2026-108338 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-108338 being exploited in the wild.

How severe is CVE-2026-108338?

Informational severity, published 11 November 2026.

How is CVE-2026-108338 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-108338?

Check whether you run Apache Roller at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-108338: Apache Roller stored cross-site scripting in entry tags

CVE-2026-108338 · Severity: info · Published 2026-11-11

Apache Roller is a blogging platform that allows users to publish and manage web content. Authenticated weblog authors can inject malicious scripts into entry tags via AtomPub, which execute in the browsers of anyone viewing the blog. This is a concern when untrusted authors have blogging privileges and the server's weblogAdminsUntrusted setting is enabled (the default configuration since version 6.1.4).

Technologies: Apache Roller. Vendors: Apache.

Quick answers

Is CVE-2026-108338 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-108338 being exploited in the wild.
How severe is CVE-2026-108338?: Informational severity, published 11 November 2026.
Which products and versions are affected?: Apache Roller 5.0.1 through 6.1.6.
Is there a fix for CVE-2026-108338?: Yes: fixed in Apache Roller 6.1.7 or later. Until then: AtomPub is disabled by default; ensure it remains disabled if not needed. Restrict Author role privileges to trusted users only, or disable the weblogAdminsUntrusted setting if your deployment does not require untrusted authors. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-108338 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-108338?: Check whether you run Apache Roller at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: Apache Roller 6.1.7 or later

AtomPub is disabled by default; ensure it remains disabled if not needed. Restrict Author role privileges to trusted users only, or disable the weblogAdminsUntrusted setting if your deployment does not require untrusted authors.

Technical details

A stored cross-site scripting vulnerability exists in Apache Roller 5.0.1 through 6.1.6 where HTML-significant characters are not filtered from entry tag names submitted via AtomPub. The bundled themes and showEntryTags macro output tag names without escaping them, allowing script execution. The attack requires authentication with Author role and relies on AtomPub being enabled, though it is disabled by default. The fix removes HTML characters from tag names both during input validation and when reading previously stored names.

Affected products

Apache Roller 5.0.1 through 6.1.6

Timeline

2026-11-11: disclosed
2026-10-09: patched: Fix merged in PR #208 for version 6.1.7

References

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