PT-2026-35878 · Unknown · Phpspreadsheet

Keyvanhardani · Published 2026-04-28 · Updated 2026-05-07 · CVE-2026-40296

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions PhpSpreadsheet (affected versions not specified)

Description An HTML escaping bypass allows for Cross-Site Scripting (XSS), a technique where malicious scripts are injected into otherwise trusted websites.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-40296

GHSA-HRMW-QPRP-WGMC

Affected Products

Phpspreadsheet

References · 13

• 🔥 https://github.com/PHPOffice/PhpSpreadsheet/security/advisories/GHSA-hrmw-qprp-wgmc · Exploit
• https://osv.dev/vulnerability/GHSA-hrmw-qprp-wgmc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40296 · Security Note
• https://github.com/PHPOffice/PhpSpreadsheet · Note
• https://twitter.com/lyrie_ai/status/2049710805659025860 · Twitter Post
• https://twitter.com/infoflowcloud/status/2052402204204544399 · Twitter Post
• https://t.me/CVEtracker/52922 · Telegram Post
• https://twitter.com/CVEnew/status/2052400867127816225 · Twitter Post
• https://twitter.com/lyrie_ai/status/2049710807454294144 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2052240881323790584 · Twitter Post
• https://twitter.com/dailycve/status/2049298457727222181 · Twitter Post
• https://reddit.com/r/VulnMatter/comments/1sz0bq3/resumen_diario_de_vulnerabilidades_29042026 · Reddit Post
• https://twitter.com/dailycve/status/2049299724377772469 · Twitter Post