Security readout for executives and security teams
Plain-English summary
CVE-2026-1421 is a medium-severity stored cross-site scripting issue in code-projects Online Examination System 1.0. An authenticated attacker could add content that later runs in another user’s browser when viewed. This can affect trust in examination administration pages and may enable limited data or session-related abuse, depending on application context.
Executive priority
Treat as a near-term remediation item if the product is used for exams or administration. It is not currently evidenced as actively exploited, but public disclosure increases likelihood of opportunistic testing against exposed systems.
Technical view
The reported flaw affects the Add Pages component of code-projects Online Examination System 1.0. VulDB describes remote exploitation, low attack complexity, privileges required, and user interaction required. The CVSS 4.0 score is 5.1. Public reporting says an exploit has been disclosed, but available sources do not show confirmed active exploitation.
Likely exposure
Exposure is likely limited to organizations running Online Examination System 1.0, especially where page-creation functions are reachable by authenticated users. Internet-facing deployments have higher business risk because more users may interact with stored malicious content.
Exploitation context
Public exploit information is referenced in the source bundle, so proof-of-concept knowledge may be available. The vulnerability is not listed as CISA KEV in the provided data, and no cited source confirms active exploitation in the wild.
Researcher notes
Sources identify XSS in Add Pages but do not name a fixed version or vendor patch. The affected function is described as unknown. Avoid assuming broader product versions are affected without confirming against the referenced advisory and local code.
Mitigation direction
- Check code-projects or project maintainers for updated guidance or a fixed release.
- Inventory deployments of Online Examination System 1.0.
- Limit access to Add Pages functions to trusted administrative users.
- Review custom code for output encoding and input validation around created pages.
- Consider temporary compensating controls if the feature is exposed broadly.
Validation and detection
- Confirm whether Online Examination System 1.0 is deployed.
- Identify who can access the Add Pages component.
- Review created pages for unexpected scripts or suspicious content.
- Test in a non-production environment using benign XSS validation methods only.
- Review application logs for unusual page creation or edits.
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 lookupCWE-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. 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-2026-1421 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
- 5.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
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:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
5.1MediumVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
Source materials
- CVE List V5 sourceCVE List V5
- VDB-342837 | code-projects Online Examination System Add Pages cross site scriptingCVE reference · vdb-entry, technical-description
- VDB-342837 | CTI Indicators (IOB, IOC, TTP)CVE reference · signature, permissions-required
- Submit #736605 | code-projects Online Examination System 1 Cross Site ScriptingCVE reference · third-party-advisory
- https://github.com/geo-chen/code-projects/blob/main/Online%20Examination%20System%20In%20PHP%20With%20Source%20Code.md#finding-1-stored-xss-in-all-add-pagesCVE reference · exploit
- https://code-projects.org/CVE reference · product
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.