Cross-origin session disclosure via unchecked extension messages
Published Jun 16, 2026 · Updated Jun 16, 2026
UXSS in Adobe Acrobat PDF Extension for Chrome 26.5.2.2 and earlier allows remote attackers to read rendered WhatsApp Web session data. Web-accessible extension frames parse attacker-controlled query JSON and relay it as trusted internal messages without checking the sender, enabling arbitrary storage writes and Hermes commands against another tab. A victim must have the extension and an active WhatsApp Web session and visit an attacker-controlled page; exposed data is limited to rendered DOM text such as chats, contacts, and profile details.
Summary
What happened
UXSS in Adobe Acrobat PDF Extension for Chrome 26.5.2.2 and earlier allows remote attackers to read rendered WhatsApp Web session data. Web-accessible extension frames parse attacker-controlled query JSON and relay it as trusted internal messages without checking the sender, enabling arbitrary storage writes and Hermes commands against another tab. A victim must have the extension and an active WhatsApp Web session and visit an attacker-controlled page; exposed data is limited to rendered DOM text such as chats, contacts, and profile details.
The record
- CVE
- CVE-2026-48294
- Published
- Jun 16, 2026
- Updated
- Jun 16, 2026
- Vendor
- Adobe
- Product
- Adobe Acrobat extension for Chrome
- Classifications
- CWE-79, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 16, 2026CVE publishedPublication date reported by the CVE source.
- Jun 16, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=26.5.2.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- HermeticReader browser-extension exploit chainfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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