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Advisory record · GHSA-mpr7-6m5w-76rw

Astro: Arbitrary CSS injection in Astro View Transitions

CVSS 2.3 LowEPSS 0.0050 · 43rd percentile

Published by the GitHub Advisory Database at 22 Oct 2026, 16:29 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
astronpm>=7.1.0, <7.3.37.3.3
Identifiers
GHSA-mpr7-6m5w-76rw · CVE-2026-114127
Weakness (CWE)
CWE-79
Tags
Published
22 Oct 2026
Updated
22 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Astro versions 7.1.0 through 7.3.2 are affected by a CSS injection issue in View Transitions, where string animation values such as duration were not escaped inside the generated stylesheet. An attacker who can control a value passed into a transition animation property, which the source describes as an uncommon pattern, could add arbitrary CSS to the rendered page, which may restyle or conceal content or misrepresent the UI. Upgrade to astro 7.3.3, which fixes the issue.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
2.3 Low 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0050, the 43rd percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.