# 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.

- **Severity:** Low 3.5 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N`)
- **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 available:** No
- **Published:** 1 Aug 2026
- **Updated:** 5 Aug 2026
- **Also known as:** GHSA-jjxc-6f47-pv8f

## 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 (Insufficient Verification of Data Authenticity)

## 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.

## Is CVE-2026-10827 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10827 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-10827 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10827 exists.

Affected product: Unknown Spectra Legacy. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-10827/ (Markdown: https://insights.sbomify.com/CVE-2026-10827/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-10827
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-10827
- OSV: https://osv.dev/vulnerability/CVE-2026-10827

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-10827/
Summaries are generated and may contain mistakes; the official description above is the record.