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HermeticReader is a UXSS-class vulnerability chain in the Adobe Acrobat PDF Extension for Chrome affecting versions 26.5.2.2 and earlier. Web-accessible extension resources relay attacker-controlled commands to a service worker that fails to validate message senders. Unrestricted writes to extension storage allow an attacker to activate the dormant Hermes WhatsApp integration and send forged commands targeting a WhatsApp Web tab. These commands enable privileged DOM manipulation and cross-origin disclosure of rendered session data after a victim visits a malicious webpage. The demonstrated exfiltration technique injects a form into WhatsApp Web and submits rendered page text to an attacker-controlled server.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
46 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A cross-origin data disclosure vulnerability affecting the Adobe Create PDF Chrome extension in versions 26.5.2.2 and earlier, with a reported CVSS score of 7.4. It can expose victim session data. The article cites a demonstration of one-click WhatsApp chat, contact, and private-information exfiltration. Vidar telemetry showed invocation of the vulnerable extension, but the article does not explicitly establish exploitation of this specific CVE in the campaign.
Une chaîne de vulnérabilités dans l’extension Chrome Adobe Acrobat permettant d’activer le moteur Hermes, de contourner les contrôles de messagerie interne et d’exfiltrer le contenu rendu de WhatsApp Web depuis le navigateur de la victime.
A vulnerability in the Adobe Acrobat PDF extension for Chrome that allowed a malicious website to abuse the extension’s privileged context to bypass same-origin protections and access WhatsApp Web data from an open session.
A vulnerability in the Adobe Acrobat PDF extension for Chrome that allowed a malicious website to abuse the extension’s privileged context to bypass same-origin protections and access WhatsApp Web data, including chats, contacts, profile name, messages, and the open conversation.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.