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4 vulnerabilities by cryptpad
CVE-2026-26028 (GCVE-0-2026-26028)
Vulnerability from cvelistv5 – Published: 2026-05-20 18:51 – Updated: 2026-05-20 19:33
VLAI
Title
CryptPad: Sanitizer Bypass in Diffmarked.js Allows Arbitrary HTML Injection and Potential XSS
Summary
CryptPad is an end-to-end encrypted collaborative office suite. In versions prior to 2026.2.0, the HTML sanitizer in Diffmarked.js can be bypassed due to incomplete attribute filtering on restricted tags. The sanitizer validates only the src attribute of <iframe>, <video>, and <audio> elements, leaving all other attributes unchecked. As a result, an attacker can inject arbitrary HTML through srcdoc, completely defeating CryptPad's intended bounce sandboxing and enabling link injection or other interactive content within user-controlled documents. The root cause lies in how the sanitizer classifies and enforces tag restrictions: although it defines both forbidden and restricted tag lists, <iframe> is treated as "restricted" rather than "forbidden." Enforcement then inspects only the src attribute, so pairing a benign blob: src with a malicious srcdoc results in unrestricted rendering. This issue has been fixed in version 2026.2.0.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/cryptpad/cryptpad/security/adv… | x_refsource_CONFIRM |
| https://github.com/cryptpad/cryptpad/releases/tag… | x_refsource_MISC |
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CVE-2025-51846 (GCVE-0-2025-51846)
Vulnerability from cvelistv5 – Published: 2026-04-30 16:35 – Updated: 2026-04-30 17:15
VLAI
Title
CryptPad unbounded WebSocket frame flood
Summary
CryptPad 2025.3.1 allows unbounded WebSocket frame flood. A remote, unauthenticated attacker can significantly degrade or deny service for all users of a CryptPad instance. Fixed in 2026.2.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
Impacted products
Date Public
2026-03-25 00:00
Credits
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CVE-2025-49591 (GCVE-0-2025-49591)
Vulnerability from cvelistv5 – Published: 2025-06-18 22:15 – Updated: 2025-06-23 16:42
VLAI
Title
CryptPad 2FA Bypass Vulnerability
Summary
CryptPad is a collaboration suite. Prior to version 2025.3.0, enforcement of Two-Factor Authentication (2FA) in CryptPad can be trivially bypassed, due to weak implementation of access controls. An attacker that compromises a user's credentials can gain access to the victim's account, even if the victim has 2FA set up. This is due to 2FA not being enforced if the path parameter is not 44 characters long, which can be bypassed by simply URL encoding a single character in the path. This issue has been patched in version 2025.3.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/cryptpad/cryptpad/security/adv… | x_refsource_CONFIRM |
| https://github.com/cryptpad/cryptpad/commit/0c5d4… | x_refsource_MISC |
| https://github.com/cryptpad/cryptpad/commit/f624f… | x_refsource_MISC |
| https://github.com/cryptpad/cryptpad/blob/15c81aa… | x_refsource_MISC |
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CVE-2025-49590 (GCVE-0-2025-49590)
Vulnerability from cvelistv5 – Published: 2025-06-18 22:14 – Updated: 2025-06-23 16:41
VLAI
Title
CryptPad Dom-Based Cross-Site Scripting (XSS) Vulnerability
Summary
CryptPad is a collaboration suite. Prior to version 2025.3.0, the "Link Bouncer" functionality attempts to filter javascript URIs to prevent Cross-Site Scripting (XSS), however this can be bypassed. There is an "early allow" code path that happens before the URI's protocol/scheme is checked, which a maliciously crafted URI can follow. This issue has been patched in version 2025.3.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-692 - Incomplete Denylist to Cross-Site Scripting
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/cryptpad/cryptpad/security/adv… | x_refsource_CONFIRM |
| https://github.com/cryptpad/cryptpad/commit/d5e48… | x_refsource_MISC |
| https://github.com/cryptpad/cryptpad/blob/15c81aa… | x_refsource_MISC |
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