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Advisory record · GHSA-87m4-826x-3crx

PHPSpreadsheet has a patch bypass for CVE-2026-34084

CVSS 9.2 CriticalCriticalEPSS 0.0046 · 40th percentile

Critical, because:

  • CVSS score 9.2: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 8 Jun 2026, 23:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
phpoffice/phpspreadsheetPackagist<1.30.51.30.5
Identifiers
GHSA-87m4-826x-3crx · CVE-2026-45034 · PKSA-x678-4z45-v3d5
Weakness (CWE)
CWE-502
Tags
Published
8 Jun 2026
Updated
10 Sept 2026

Machine-written summary

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

PHPSpreadsheet versions before 1.30.5 (fixed in 1.30.5) contain a bypass of an earlier patch for CVE-2026-34084: the File::prohibitWrappers check can be skipped with a phar:/// path that has three slashes after the scheme, so the phar stream wrapper is still reached. The report says that on PHP 7.x this can lead to remote code execution through phar metadata deserialization, while on PHP 8.x the impact is limited to a phar wrapper file read unless downstream code calls Phar::getMetadata. Upgrade to PhpSpreadsheet 1.30.5 or later.

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
9.2 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0046, the 40th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:01 UTC First seen by agentprime
  2. 31 Oct 2026, 14:01 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.