Security readout for executives and security teams
Plain-English summary
CVE-2018-8926 is a high-severity privilege escalation issue in Synology Photo Station. An authenticated remote user could abuse weak input validation around the fullname parameter to gain higher privileges. The main business risk is unauthorized access or control inside a Synology photo service.
Executive priority
Treat this as a prompt patching item for any active Synology Photo Station deployment. It requires an account, but successful abuse could compromise confidentiality, integrity, and availability of the service.
Technical view
The issue is described as a permissive regular expression flaw in synophoto_dsm_user. It affects Synology Photo Station before 6.8.5-3471 and before 6.3-2975. CVSS 3.0 rates it 8.8 with network access, low complexity, low privileges, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely in Synology NAS environments running Photo Station below the fixed 6.8.5-3471 or 6.3-2975 releases, especially where authenticated user access is broadly available or externally reachable.
Exploitation context
The source bundle does not show CISA KEV listing or public active exploitation evidence. Exploitation is still plausible because CVSS indicates remote, low-complexity exploitation by an authenticated user without user interaction.
Researcher notes
Evidence is limited to CVE metadata and Synology’s advisory reference. The described sink is synophoto_dsm_user and the input is fullname. Do not assume unauthenticated exploitation or active exploitation without additional sources.
Mitigation direction
- Upgrade Synology Photo Station to 6.8.5-3471, 6.3-2975, or a later supported release.
- Review Synology advisory SA-18-15 before selecting the correct package branch.
- Restrict Photo Station access to trusted users until patched.
- Disable Photo Station if it is not operationally required.
- Review account privileges after patching for unexpected changes.
Validation and detection
- Inventory all Synology Photo Station installations and record installed versions.
- Confirm whether each instance is below 6.8.5-3471 or 6.3-2975.
- Check whether Photo Station is reachable from untrusted networks.
- Review users with Photo Station access, including low-privilege accounts.
- Look for unexpected privilege changes or suspicious account activity.
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-625: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-8926 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
- 8.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.synology.com/zh-tw/support/security/Synology_SA_18_15CVE reference · x_refsource_CONFIRM
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.
Permissive Regular Expression
Permissive Regular Expression represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.