Security readout for executives and security teams
Plain-English summary
ChurchCRM before 6.7.2 lets a low-privileged user store malicious script content in a calendar event description. When another user, including an administrator, views the event, the script can run in that user’s browser and may lead to account takeover. Organizations using ChurchCRM should treat this as urgent if untrusted or lower-privileged users can create events.
Executive priority
Prioritize patching within the normal high-severity window, faster for internet-facing or broadly used ChurchCRM systems. The business concern is account takeover through routine calendar viewing, especially administrator sessions.
Technical view
CVE-2026-24855 is a stored cross-site scripting issue in ChurchCRM’s Create Events function for Church Calendar. The vulnerable input is the Description field. A stored payload can execute when viewed by other users. The advisory rates it high, CVSS 4.0 score 7.2, CWE-79. Affected versions are ChurchCRM CRM prior to 6.7.2; version 6.7.2 fixes it.
Likely exposure
Exposure is limited to ChurchCRM deployments running versions earlier than 6.7.2. Risk is higher where low-privileged accounts can create calendar events and administrators or staff routinely view them.
Exploitation context
The CVE record says exploitation requires network access, low privileges, and user interaction by a viewer. The source bundle does not show CISA KEV listing or confirmed active exploitation. The CVSS vector indicates proof-of-concept exploit maturity, but no weaponization details are provided here.
Researcher notes
Evidence is strongest from the GitHub security advisory and CVE record. The issue is stored XSS in a specific field and workflow. The provided sources identify the fixed version and two commits, but do not provide active exploitation evidence or broader affected-product claims.
Mitigation direction
- Upgrade ChurchCRM to version 6.7.2 or later.
- Follow the ChurchCRM GitHub advisory and linked commits for official remediation details.
- Temporarily restrict calendar event creation to trusted users until patched.
- Review existing calendar event descriptions for unexpected script-like content.
Validation and detection
- Inventory ChurchCRM instances and confirm installed versions.
- Flag any ChurchCRM version earlier than 6.7.2 as affected.
- After upgrade, verify event descriptions render safely as non-executable content.
- Review audit logs for unusual event creation by low-privileged accounts.
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 lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-24855 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
- High
- CVSS
- 7.2 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/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:H/VA:N/SC:H/SI:H/SA:H/E:P——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
7.2HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H/E:P
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ChurchCRM/CRM/security/advisories/GHSA-49qp-cfqx-c767CVE reference · x_refsource_CONFIRM
- https://github.com/ChurchCRM/CRM/commit/0cd0d211459b8c19509d36b3c1dfcd7f8c10d914CVE reference · x_refsource_MISC
- https://github.com/ChurchCRM/CRM/commit/ec4b16e9a3ca09c8a01a712bcb90579c42f2ba28CVE 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.