CVE-2026-10856
CVE-2026-10856 is a medium-severity vulnerability in Misp-project Misp with a CVSS 3.x base score of 6.1. 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-601.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v4: 5.1
- EPSS exploit prediction: 0% (4th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-34262
- Weakness: CWE-601
- Affected product: Misp-project Misp
- Published:
- Last modified:
Description
A URL validation flaw in the MISP dashboard button widget allowed a crafted relative-looking URL to be accepted as a local path while being interpreted by browsers as an external URL. The validation rejected URLs containing an explicit scheme, host, or user component, but did not reject paths beginning with a slash followed by a backslash, such as /\example.com. Some browsers normalize backslashes in URLs as forward slashes, which can turn this into a scheme-relative external navigation target. In addition, the generated href concatenated the reconstructed URL with the original URL, increasing the possibility of unsafe or malformed link generation. An attacker able to configure or influence a dashboard button URL could craft a button that appears to point inside the application but redirects users to an attacker-controlled site when clicked. This could be used for phishing, credential theft, or social engineering. The patch fixes the issue by rejecting empty paths and paths starting with /\, and by emitting only the reconstructed validated URL in the anchor href.
Frequently asked questions
- What is CVE-2026-10856?
- A URL validation flaw in the MISP dashboard button widget allowed a crafted relative-looking URL to be accepted as a local path while being interpreted by browsers as an external URL. The validation rejected URLs containing an explicit scheme, host, or user component, but did not reject paths beginning with a slash followed by a backslash, such as /\example.com. Some browsers normalize backslashes in URLs as forward slashes, which can turn this into a scheme-relative external navigation target. In addition, the generated href concatenated the reconstructed URL with the original URL, increasing the possibility of unsafe or malformed link generation. An attacker able to configure or influence a dashboard button URL could craft a button that appears to point inside the application but redirects users to an attacker-controlled site when clicked. This could be used for phishing, credential theft, or social engineering. The patch fixes the issue by rejecting empty paths and paths starting with /\, and by emitting only the reconstructed validated URL in the anchor href.
- How severe is CVE-2026-10856?
- CVE-2026-10856 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2026-10856 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-10856?
- CVE-2026-10856 affects Misp-project Misp. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-10856?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-10856 have an EU (EUVD) identifier?
- Yes. CVE-2026-10856 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34262.
- When was CVE-2026-10856 published?
- CVE-2026-10856 was published on 2026-06-04 and last updated on 2026-06-22.
References
Affected products (1)
- cpe:2.3:a:misp-project:misp:*:*:*:*:*:*:*:*
More vulnerabilities in Misp-project Misp
- CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
- CVE-2024-29859 — Critical (CVSS 9.8): In MISP before 2.4.187, add_misp_export in app/Controller/EventsController.php does not properly check for a valid file…
- CVE-2024-29858 — Critical (CVSS 9.8): In MISP before 2.4.187, __uploadLogo in app/Controller/OrganisationsController.php does not properly check for a valid…
- CVE-2024-25675 — Critical (CVSS 9.8): An issue was discovered in MISP before 2.4.184. A client does not need to use POST to start an export generation…
- CVE-2024-25674 — Critical (CVSS 9.8): An issue was discovered in MISP before 2.4.184. Organisation logo upload is insecure because of a lack of checks for…
- CVE-2023-50918 — Critical (CVSS 9.8): app/Controller/AuditLogsController.php in MISP before 2.4.182 mishandles ACLs for audit logs.
All CVEs affecting Misp-project Misp →
Other CWE-601 (Open Redirect) vulnerabilities
- CVE-2018-3774 — Critical (CVSS 10.0): Incorrect parsing in url-parse <1.4.3 returns wrong hostname which leads to multiple vulnerabilities such as SSRF, Open…
- CVE-2019-25282 — Critical (CVSS 9.8): V-SOL GPON/EPON OLT Platform v2.03 contains an open redirect vulnerability in the script that allows attackers to…
- CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
- CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
- CVE-2025-55031 — Critical (CVSS 9.8): Malicious pages could use Firefox for iOS to pass FIDO: links to the OS and trigger the hybrid passkey transport. An…
- CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.