CVE-2026-26273 Known affected by Account Takeover via Password Reset Token Leakage

What is CVE-2026-26273?

CVE-2026-26273 is a critical vulnerability in idno known, published on 13 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Known is a social publishing platform. Prior to 1.6.3, a Critical Broken Authentication vulnerability exists in Known 1.6.2 and earlier. The application leaks the password reset token within a hidden HTML input field on the password reset page. This allows any unauthenticated attacker to retrieve the reset token for any user by simply querying the user's email, leading to full Account Takeover (ATO) without requiring access to the victim's email inbox. This vulnerability is fixed in 1.6.3.

Weakness: CWE-640, CWE-200

Which versions are affected by CVE-2026-26273?

2 open source packages ship an affected version, including idno/known. It affects 1 product.

Products include Withknown Known.

How do I fix CVE-2026-26273?

Upgrade idno/known to 1.6.3 or later.

Is CVE-2026-26273 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-26273 exists.

Other vulnerabilities in idno known

• CVE-2026-28508 Idno: Unauthenticated SSRF via URL Unfurl Endpoint Critical 9.2
• CVE-2022-33011 Known vulnerable to account takeover via host header injection attack in v1.3.1 High 8.8
• CVE-2026-28507 Idno: Remote Code Execution via Chained Import File Write and Template Path Traversal High 8.6
• CVE-2022-32115 Known vulnerable to code execution via SVG file in v1.3.1 Medium 6.1
• CVE-2022-31290 Known v1.3.1 Cross-site Scripting Medium 5.4

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-78wq-6gcv-w28r.