Security readout for executives and security teams
Plain-English summary
CVE-2026-27612 is a reflected XSS issue in the Repostat React package before 1.0.1. It matters if an application passes untrusted user input into the RepoCard repo prop. In that case, a crafted link could run JavaScript in a victim’s browser. The vendor advisory states version 1.0.1 fixes the issue.
Executive priority
Treat as a normal-priority frontend security update unless Repostat is exposed in customer-facing flows with user-controlled repo input. The main business risk is browser-based script execution against users, potentially affecting session data or page integrity depending on the hosting application.
Technical view
RepoCard used React dangerouslySetInnerHTML to render the repo prop during the loading state without sanitization. If applications source repo from unvalidated input, such as a URL parameter, HTML/JavaScript can be interpreted by the browser. The fix removes dangerouslySetInnerHTML and uses standard React JSX binding, which escapes HTML entities.
Likely exposure
Exposure is limited to applications using denpiligrim/repostat versions before 1.0.1 and passing unvalidated user-controlled values into RepoCard’s repo prop. Applications using fixed versions or only trusted hardcoded repo values are less likely to be affected.
Exploitation context
The advisory describes user interaction as required: a victim must load a page or link containing attacker-controlled input that reaches the repo prop. No source provided here reports active exploitation, and the CVE is not listed as KEV in the supplied bundle.
Researcher notes
This is CWE-79 reflected XSS with CVSS 6.1. The vulnerable condition is contextual: package version alone is not enough; exploitability depends on how the consuming application populates repo. Public sources identify the patched version and code change, but do not provide evidence of exploitation in the wild.
Mitigation direction
- Upgrade denpiligrim/repostat to version 1.0.1 or later.
- Review application code for user-controlled values passed to RepoCard repo.
- Validate or constrain repository identifiers before rendering them.
- Avoid using untrusted input with components that render HTML directly.
Validation and detection
- Inventory frontend dependencies for denpiligrim/repostat.
- Confirm installed versions are 1.0.1 or later.
- Search code for RepoCard usage and repo prop sources.
- Verify URL parameters or form values cannot directly populate repo.
- Review the referenced commit to confirm the patched rendering behavior.
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-2026-27612 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
- 6.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.1MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/denpiligrim/repostat/security/advisories/GHSA-fm8c-6m29-rp6jCVE reference · x_refsource_CONFIRM
- https://github.com/denpiligrim/repostat/commit/715df5f73359d222fd7876e948d14290180e3c88CVE reference · x_refsource_MISC
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.