CVE-2026-35460: Papra has an HTML Injection in Transactional Emails via Unescaped User Display Name

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-07 · updated 2026-06-17
Weakness: CWE-79

Description

Papra is a minimalistic document management and archiving platform. Prior to 26.4.0, transactional email templates in Papra interpolate user.name directly into HTML without escaping or sanitization. An attacker who registers with a display name containing HTML tags will have those tags injected into the verification and password reset email bodies. Since emails are sent from the legitimate domain (e.g: auth@mail.papra.app), this enables convincing phishing attacks that appear to originate from official Papra notifications. This vulnerability is fixed in 26.4.0.

Affected products

papra-hq papra: before 26.4.0 — fixed in 26.4.0

How to fix

Upgrade to a fixed version: papra-hq papra 26.4.0. Check the vendor advisory for mitigations.

References

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