Security readout for executives and security teams
Plain-English summary
CVE-2026-24824 is a cross-site scripting issue in YaCy Search Server. An attacker could cause unsafe content to be generated by the web interface, potentially affecting users who access it. The public record rates it medium severity. There is no cited evidence of active exploitation or CISA KEV listing.
Executive priority
Address during the next regular vulnerability remediation cycle, sooner for internet-facing YaCy deployments. Business risk is mainly browser-based compromise through the YaCy web interface, not direct server takeover based on current public evidence.
Technical view
The issue is CWE-79 improper input neutralization during web page generation in yacy/yacy_search_server, specifically referenced around source/net/yacy/http/servlets and YaCyDefaultServlet.Java. CVSS v4.0 is 6.9 with network attack vector, low complexity, no privileges, and no user interaction indicated in the CVE vector. GitHub PR #722 is tagged as a patch reference.
Likely exposure
Organizations running YaCy Search Server with accessible administrative or search web interfaces may be exposed. The CVE record does not provide precise affected release ranges beyond listing yacy_search_server as affected, so inventory confirmation is necessary.
Exploitation context
No source in the provided bundle reports active exploitation. The CVSS vector indicates remote network reachability and low attack complexity, but the public details do not describe a working exploit path. Treat internet-exposed YaCy instances as higher priority for review.
Researcher notes
The CVE metadata is sparse. It names the affected project and file area and links one patch PR, but does not provide fixed versions, affected version ranges, or exploit details. Further analysis should focus on the PR diff and official YaCy release notes.
Mitigation direction
- Review GitHub pull request #722 and apply the vendor patch if applicable.
- Check YaCy project guidance for a fixed release or official upgrade path.
- Restrict external access to YaCy web interfaces where business requirements allow.
- Prioritize remediation for internet-facing or shared-user deployments.
Validation and detection
- Identify all deployed YaCy Search Server instances and exposed web interfaces.
- Compare local code or package version against vendor guidance and PR #722.
- Confirm whether YaCyDefaultServlet.Java includes the upstream patch changes.
- Review access logs for unusual requests to YaCy servlet endpoints.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-24824 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.9 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/AU:Y/R:U/V:D/RE:M/U:Amber
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/AU:Y/R:U/V:D/RE:M/U:Amber——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
6.9MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/AU:Y/R:U/V:D/RE:M/U:Amber
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/yacy/yacy_search_server/pull/722CVE reference · patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.