The LuxCal Web Calendar: Missing Authentication for Critical Functionality
CVE-2025-25224 is a high-severity missing authentication for critical functionality vulnerability in The LuxCal Web Calendar from LuxSoft, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected The LuxCal Web Calendar versions: prior to 5.3.3M (MySQL version); prior to 5.3.3L (SQLite version). The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.58% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Luxcal Web Calendar to 5.3.3l or 5.3.3m, whichever matches your release line, or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| LuxSoft | The LuxCal Web Calendar | prior to 5.3.3M (MySQL version); prior to 5.3.3L (SQLite version) | Not stated |
| Luxsoft | Luxcal Web Calendar | before 5.3.3l; before 5.3.3m | 5.3.3l, 5.3.3m |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 3.0 | 5.3 | Medium | CNA (jpcert.or.jp) |
Official description
The LuxCal Web Calendar prior to 5.3.3M (MySQL version) and prior to 5.3.3L (SQLite version) contains a missing authentication vulnerability in dloader.php. If this vulnerability is exploited, arbitrary files on a server may be obtained.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Missing Authentication for Critical Functionality
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
How developers prevent this class of flaw
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
- Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator.
- When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data.
More Missing Authentication for Critical Functionality vulnerabilities (CWE-306)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- luxsoft.eu/lcforum/viewtopic.php?pid=1984#p1984Release Notes
Third-party and government advisories
- jvn.jp/en/jp/JVN26024080/Third Party Advisory
Other references
- luxsoft.eu/?downloadProduct
Other vulnerabilities in The LuxCal Web Calendar
- 9.8 Critical severity
- 9.8 Critical severity
Recent Missing Authentication for Critical Functionality vulnerabilities
- 9.8 Critical severity
- 9.8 Critical severity
- 9.1 Critical severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
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