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CVE-2017-16920· NVD / CVE Program· CNA mitre

v5/config/system.php in dayrui FineCms 5.2.0 has a default SYS_KEY value and does not require key regeneration for each installation, which

v5/config/system.php in dayrui FineCms 5.2.0 has a default SYS_KEY value and does not require key regeneration for each installation, which allows remote attackers to upload arbitrary .php files via a member api swfupload action to index.php.

CriticalCVSS 9.8 · v3.0—No exploit No fix recorded
Published
Nov 21, 2017
Updated
Jun 16, 2026
EPSS
2.1% · 81th percentile
CWE
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JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.1%

Affected systems

VendorProduct
finecmsfinecms

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • finecms finecms5.2.0

Same product

finecms: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-6893controllers/member/Api.php in dayrui FineCms 5.2.0 has SQL Injection: a request with s=member,c=api,m=checktitle, and the parameter 'module'
    40Plan
  • CVE-2017-11585dayrui FineCms 5.0.9 has remote PHP code execution via the param parameter in an action=cache request to libraries/Template.php, aka Eval In
    40Plan
  • CVE-2017-11584dayrui FineCms 5.0.9 has SQL Injection via the field parameter in an action=module, action=member, action=form, or action=related request to
    39Monitor
  • CVE-2017-11583dayrui FineCms 5.0.9 has SQL Injection via the catid parameter in an action=related request to libraries/Template.php.
    39Monitor
  • CVE-2017-11582dayrui FineCms 5.0.9 has SQL Injection via the num parameter in an action=related or action=tags request to libraries/Template.php.
    39Monitor
  • CVE-2018-18191Cross-site request forgery (CSRF) vulnerability in /admin.php?c=member&m=edit&uid=1 in dayrui FineCms 5.4 allows remote attackers to change
    35Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records