How severe is CVE-2026-26273?

CVE-2026-26273 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-26273 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26273?

CVE-2026-26273 affects Withknown Known. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26273?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-26273 have an EU (EUVD) identifier?

Yes. CVE-2026-26273 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7362.

When was CVE-2026-26273 published?

CVE-2026-26273 was published on 2026-02-13 and last updated on 2026-06-17.

CVE-2026-26273

CVE-2026-26273 is a critical-severity vulnerability in Withknown Known with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7362
Weakness: CWE-200
Affected product: Withknown Known
Published: 2026-02-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-26273?: 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.
How severe is CVE-2026-26273?: CVE-2026-26273 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-26273 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26273?: CVE-2026-26273 affects Withknown Known. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26273?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-26273 have an EU (EUVD) identifier?: Yes. CVE-2026-26273 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7362.
When was CVE-2026-26273 published?: CVE-2026-26273 was published on 2026-02-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:withknown:known:*:*:*:*:*:*:*:*

More vulnerabilities in Withknown Known

CVE-2022-33011 — High (CVSS 8.8): Known v1.3.1+2020120201 was discovered to allow attackers to perform an account takeover via a host header injection…
CVE-2026-28508 — High (CVSS 8.6): Idno is a social publishing platform. Prior to version 1.6.4, a logic error in the API authentication flow causes the…
CVE-2026-28507 — High (CVSS 7.2): Idno is a social publishing platform. Prior to version 1.6.4, there is a remote code execution vulnerability via…
CVE-2022-32115 — Medium (CVSS 6.1): An issue in the isSVG() function of Known v1.2.2+2020061101 allows attackers to execute arbitrary code via a crafted…
CVE-2022-31290 — Medium (CVSS 5.4): A cross-site scripting (XSS) vulnerability in Known v1.2.2+2020061101 allows authenticated attackers to execute…
CVE-2022-30852 — Medium (CVSS 4.3): Known v1.3.1 was discovered to contain an Insecure Direct Object Reference (IDOR).

All CVEs affecting Withknown Known →

Other CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities

CVE-2026-27604 — Critical (CVSS 10.0): FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version…
CVE-2026-40965 — Critical (CVSS 10.0): Cloud Foundry UAA versions v76.12.0 through v78.12.0 are vulnerable to a private key exposure. The server contains a…
CVE-2026-42826 — Critical (CVSS 10.0): Exposure of sensitive information to an unauthorized actor in Azure DevOps allows an unauthorized attacker to disclose…
CVE-2025-29270 — Critical (CVSS 10.0): Incorrect access control in the realtime.cgi endpoint of Deep Sea Electronics devices DSE855 v1.1.0 to v1.1.26 allows…
CVE-2025-61481 — Critical (CVSS 10.0): An issue in MikroTik RouterOS v.7.14.2 and SwOS v.2.18 exposes the WebFig management interface over cleartext HTTP by…
CVE-2025-53624 — Critical (CVSS 10.0): The Docusaurus gists plugin adds a page to your Docusaurus instance, displaying all public gists of a GitHub user.…

Browse all CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) vulnerabilities →