CVE-2020-35577: In Endalia Selection Portal before 4.205.0, an Insecure Direct Object Reference (IDOR) allows any authenticate

Routine

MEDIUM 6.5DOWNGRADE

CVE-2020-35577 is a medium-severity flaw (CVSS 6.5) affecting selection portal. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Endalia Selection Portal before 4.205.0, an Insecure Direct Object Reference (IDOR) allows any authenticated user to download every file uploaded to the platform by changing the value of the file identifier (aka CommonDownload identification number).

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Published	2021-02-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: endalia

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-02-18 14:15 UTCPublished CVE record published
2026-06-17 03:13 UTCUpdated Record last modified

endalia selection portal DOWNGRADE

Affected: 4.205.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.205.0

1. Check installed version

apt-cache policy selection-portal || rpm -q selection-portal || selection-portal --version

2. No fixed release: DOWNGRADE to a release before 4.205.0 (Debian / Ubuntu)

apt-cache madison selection-portal sudo apt install selection-portal=<VERSION_BEFORE_4.205.0> sudo apt-mark hold selection-portal

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list selection-portal sudo dnf downgrade selection-portal-<VERSION_BEFORE_4.205.0> sudo dnf versionlock add selection-portal

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-35577?

selection portal: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-35577 being exploited?

CVE-2020-35577 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-35577 affect?

CVE-2020-35577 affects selection portal. Severity is medium (CVSS 6.5). In Endalia Selection Portal before 4.205.0, an Insecure Direct Object Reference (IDOR) allows any authenticated user to download every file uploaded to the platform by changing the value of the file identifier (aka CommonDownload identifica

How urgent is CVE-2020-35577?

Priority 39/100. No elevated risk signals yet.

References

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