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CVE-2026-48294 is a UXSS-class cross-origin data disclosure vulnerability affecting Adobe Acrobat PDF Extension for Chrome before the fixed 26.5.2.3 release. The issue stems from missing origin and sender validation in the extension’s internal messaging and exposed internal resources, allowing an attacker-controlled web page to embed an internal extension page and send commands that are treated as trusted extension messages. This enables unauthorized writes to the extension’s local storage, including activation of Adobe’s dormant Hermes integration component used to interact with WhatsApp Web. Once enabled, the extension can perform privileged DOM operations against a WhatsApp Web tab and expose rendered cross-origin content, including chat lists, contact names, messages, profile information, and other session-associated data. The vulnerability has been described as a chain of flaws collectively dubbed HermeticReader.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A universal cross-site scripting (UXSS) vulnerability in the Adobe Acrobat PDF Extension for Chrome that could let a malicious webpage bypass same-origin protections and silently exfiltrate visible WhatsApp Web chats, contacts, and profile data from an active session.
A now-patched cross-origin data disclosure / UXSS-class vulnerability in the Adobe Acrobat Chrome extension that can bypass the browser same-origin policy and enable theft of WhatsApp Web data after user interaction.
A cross-origin data disclosure vulnerability in the Adobe Acrobat Chrome extension that could let an attacker trick a user into visiting a malicious webpage and silently exfiltrate WhatsApp Web chats, contacts, and account details by abusing the extension’s internal messaging and Hermes integration.
A chain of vulnerabilities in the Adobe Acrobat Chrome extension that can let an attacker, via a malicious web page, send forged internal extension messages, activate WhatsApp integration, and access or manipulate rendered WhatsApp Web content without authentication.
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.