Security readout for executives and security teams
Plain-English summary
CVE-2021-40310 is a reported cross-site scripting issue in openSIS Community Edition 8.0. A vulnerable attendance page parameter may allow untrusted input to run as browser script. Business impact depends on who can reach the attendance workflow and what privileges their browser session has.
Executive priority
Treat as a targeted web-application risk for schools or organizations using openSIS 8.0. Prioritize if the system is internet-facing or handles student data with privileged staff sessions.
Technical view
The CVE states that TakeAttendance.php is affected through the cp_id_miss_attn parameter. The supplied record has no CVSS score, CWE, vendor patch statement, or affected CPE data. Assessment should focus on deployed openSIS Community Edition 8.0 instances and exposure of the attendance feature.
Likely exposure
Likely limited to organizations running openSIS Community Edition 8.0 with access to TakeAttendance.php. The bundle does not establish exposure for other editions, later versions, or hosted deployments.
Exploitation context
The CVE is public and references a disclosure report and video. The supplied sources do not show CISA KEV listing or confirmed active exploitation, so active exploitation should not be assumed.
Researcher notes
Evidence is sparse: the source bundle identifies the vulnerable file and parameter but lacks CVSS, CWE, patch status, and exploit-in-the-wild confirmation. Avoid expanding affected scope beyond openSIS Community Edition 8.0 without vendor evidence.
Mitigation direction
- Check OS4ED/openSIS guidance for fixed versions or official patches.
- Upgrade away from openSIS Community Edition 8.0 if vendor guidance identifies a fixed release.
- Restrict attendance-page access to trusted authenticated staff only.
- If maintaining code, ensure affected output is properly encoded before rendering.
- Monitor for suspicious requests involving TakeAttendance.php.
Validation and detection
- Inventory openSIS deployments and confirm exact version numbers.
- Check whether TakeAttendance.php is reachable from untrusted networks or roles.
- Review application logs for requests referencing cp_id_miss_attn.
- Have defenders test safely for reflected or stored script execution.
- Confirm any vendor patch or code change removes unsafe rendering.
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.
CVE-2021-40310 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/OS4ED/openSIS-ClassicCVE reference · x_refsource_MISC
- https://www.youtube.com/watch?v=aPKPUDmmYpcCVE reference · x_refsource_MISC
- https://github.com/MiSERYYYYY/Vulnerability-Reports-and-Disclosures/blob/main/OpenSIS-Community-8.0.mdCVE 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.