Answer in brief
CVE-2023-34089 records a High severity (CVSS 8.1) vulnerability in Decidim Cross-site Scripting vulnerability in the processes filter. The current sources do not mark it as known exploited. The current feed maps decidim (rubygems), decidim (rubygems), decidim-core (rubygems), decidim-core (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps decidim (rubygems), decidim (rubygems), decidim-core (rubygems), decidim-core (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| decidimrubygems | >=0.14.0 <0.26.7 | 0.26.7 |
| decidimrubygems | >=0.27.0 <0.27.3 | 0.27.3 |
| decidim-corerubygems | >=0.14.0 <0.26.7 | 0.26.7 |
| decidim-corerubygems | >=0.27.0 <0.27.3 | 0.27.3 |
Published upstream
Jul 11, 2023
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
### Impact The processes filter feature is susceptible to Cross-site scripting. This allows a remote attacker to execute JavaScript code in the context of a currently logged-in user. An attacker could use this vulnerability to make other users endorse or support proposals they have no intention of supporting or endorsing. ### Patches The problem was patched in [v0.27.3](https://github.com/decidim/decidim/releases/tag/v0.27.3) and [v0.26.7](https://github.com/decidim/decidim/releases/tag/v0.26.7)
Quoted source text, attributed separately from HOL analysis.