CVE-2026-10827 Spectra (Ultimate Addons for Gutenberg) < 2.20.0 - Contributor+ Stored CSS Injection via Block Attributes
Contributors can inject arbitrary CSS into pages, enabling data exfiltration or defacement for anonymous visitors in the Spectra Legacy WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-10827?
CVE-2026-10827 is a low-severity cross-site scripting vulnerability in Unknown Spectra Legacy, published on 1 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The Spectra Legacy WordPress plugin before 2.20.0 does not validate or escape several block style attributes before using them to build the CSS it outputs on the front end, allowing users with the Contributor role and above to inject arbitrary CSS into the pages that render the affected block. The injected styles are served to anonymous visitors of those pages and can force external resource loads, deface/redress the page, or exfiltrate data via CSS attribute selectors. JavaScript execution is not possible at this role (the script-tag breakout is removed by KSES), so the impact is limited to CSS injection.
Weakness: CWE-345
Which versions are affected by CVE-2026-10827?
How do I fix CVE-2026-10827?
No fix has been published for CVE-2026-10827 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-10827 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10827 exists.
Sources
Also known as GHSA-jjxc-6f47-pv8f.