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CVE-2026-48294, also known as HermeticReader, is a universal cross-site scripting (UXSS)-class cross-origin data disclosure vulnerability affecting Adobe Acrobat PDF Extension for Chrome versions 26.5.2.2 and earlier. The issue stems from unsafe handling of extension-internal messaging and web-accessible resources that allowed attacker-controlled web content to interact with privileged extension functionality without proper origin or sender validation. Reported exploitation chained multiple weaknesses, including the ability to relay crafted messages to the extension service worker, perform unauthorized writes to extension local storage, and enable a dormant WhatsApp integration component known as Hermes. Once activated, the extension’s privileged context could be abused to target a WhatsApp Web tab, manipulate its DOM, and bypass normal same-origin protections. This enabled cross-origin disclosure of session-associated data rendered in the victim’s browser.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
45 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A set of vulnerabilities in the Adobe Acrobat Chrome extension that allowed any website to access WhatsApp Web conversations without proper authentication by abusing the extension’s Hermes integration and privileged DOM operations.
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.